Think about it realistically. If all four made a move AT THIS VERY INSTANT in destiny lore, who would be left standing? Process of elimination. First one's easy, fallen are dead. They have great potential. They have the intelligence to steal vex weaponry, and were gaining control of Siva. Had they not made their moves so early on every account they could have one on multiple occasions. Problem is they always jump the gun, and are too disjointed. They don't represent a race, but their own house, unlike the other races. So given time they might have a chance, but at this very instant they would be the first to go. Second one's a bit difficult. Try imagining full out war between every race. With the cabal LITTERALLY launching moons at their enemies. The Vex with an INFINITELY large army, that can pull you out of the time-stream and have you die all alone LOST IN TIME. The hive may have lost most of their power with Oryx's death, but they still have the dreadnaught mostly functioning. Assuming they get their primary weapon back online they could easily win a defensive war, merely outlasting the others. But thinking objectively I'd have to say hive would be the first to go. Cabal could easily take out their entire force on the moon, and with the dreadnaught's primary weapon disabled by us, they've already proven they have what it takes to completely destroy the dreadnaught. That leaves the meager hive forces on earth, which are barely competing with the resident fallen. Without Oryx's ability to "take," and considering that the vex learned the Sword Logic, and Worship from the hive, they have the tools to decimate them.Although they no longer have the ability to bring back their powerful "minds" due to the death of the restorative mind in this stream, the vex still have enough firepower and processing to tactically eliminate the hive. We now have the most difficult choice between Cabal and Vex. Although the Vex have the Cabal severely outnumbered, the Cabal still have major firepower to back up any moves they make. This brings us to the Cabal's fatal weakness. We've taken out all of their commanding units in this system. They don't have the tactical or strategic leadership necessary to fight on-par with the Vex. They had been holding their own against the Vex before we showed up in a half-hearted territorial war, but in a full out war for domination the Cabal are currently too weak. In the end the Vex would win, hands down. Now you could make a thousand different arguments for any race, and I'd be happy to argue or discuss them, but this is my logical breakdown of who would win, and in turn, who is the most powerful. For reference I'll include arguments I keep seeing in this thread: "The hive have paracasual powers!" Don't forget: the deathsingers? Dead. The Taken King? Dead. The dreadnaught's weapon systems? Disabled. "The Hive have other gods!" Yes, but they are too far away to matter, and they never grasped the same level of power as Oryx, one of the reason they aren't here with him. plus they are still subject to their worms. "The Fallen have Vex and Golden Age tech!" Which they never mastered because we killed them before they could. "The Cabal have an entire empire to send at us!" Which is too far away. (sensing a theme here?) "Atheon and The Nexus Mind are dead! The Vex aren't that strong anymore!" Gotta remember Atheon wasn't a combat unit. Atheon's job was to monitor and control the Conflux at the Vault of Glass a separate project to establish the Vex as permanent entities in all of time and space. His loss merely means they can't quickly reach into a different stream and pull out a new Mind when one dies. Considering in the now they are already dead, that's not currently a problem. You can make an argument for any race, but it all comes down to them requiring time, outside help, or reinforcements. so considering that I am talking about NOW, they can't have what they would need most to win. Edit #1: TL;DR, The vex would win because every other race would need backup which is too far away or non-existent.

It's so obviously the Vex. In theory, the Vex are so powerful that we could all be part of their simulation right now. They can travel freely though time itself. As soon as we entered VoG that's where our actual journey ended. The Vex simply let us defeat Atheon to plan for the outcomes ahead. For all you know you could still be stuck in VoG, unknowingly participating in the greatest experiment of all time. Literally.

As long as the position of Taken King exists it's the Hive by a long shot. The ability to Take is an automatic win against any enemy but Guardians. While the Hive might not be the most powerful right this minute because the Throne lies vacant, as long as the mantle exists their potential is far beyond any of the other 3.

SIVA Fallen seem pretty deadly.

Before killing Oryx: Hive Vex Cabal Fallen After killing Oryx: Vex Hive Cabal Fallen Fallen with SIVA might beat Cabal

hive. simply because they can't die when not in the ascendant plain. INFINITE SELF RES.

Cabal has a weapon that can destroy a planet

White

The vex? Really? The vex and the hive already went at it, and the vex never even had an edge. The hive destroyed them. Everything the vex do is trying to copy the hive. For example, VoG is the vex's best effort to make their own thrown world. The hive hands down are the strongest, of course next to the darkness itself.

My expectation is the Cabal, actually. The Vex are like the Star Trek's Borg times a thousand. The Hive are terrible beyond imagination as well, and are responsible for the complete genocide of entire worlds -countless many of them. And each world destroyed strengthens them further through the Sword Logic. However, the Cabal Empire is a force even more mighty. The Cabal legions in Sol at this time have been through the ringer, to be sure. But it is important to remember that those Cabal have been away from home for a very VERY long time. Drawn out combat in unfavorable conditions has eroded their morale, and they just aren't fighting at their peak anymore. Its also important to point out that these guys on Mars and the surrounding satellites are only the first of MANY. They're not even the tip of the spear, but just the edge of a routine invasion force. Now that these run-of-the-mill deployed troops have shown to be insufficient for an invasion of this area of space, the Empire will actually direct some real attention to the area. The Cabal are about to step up their game and usher in a whole new era of suck. Now that's not to say that the boys in Sol have been pushovers. They have stood toe to toe with the Vex and even managed to retake ground. Their plans to invade the Black Garden themselves were derailed when we showed up on the scene and beat them to it. Their weaponry and armor is extraordinary. Their guns don't fire mere bullets, but volatile mini smart rockets that detonate after penetration into the target, filling the body with shrapnel. Furthermore, they operate on a massive intelligence network that transmits real time information to the rest of the units in the area, allowing the entire force to react incredibly fast to the changing battlefield. So fast in fact that they are able to effectively combat the Vex, who think and fight as one entity; one that can also teleport at will and operate across time as well as space. While there wasn't really much of anything that they could do against Oryx and his unconventional tactic of taking enemies, their superior tactical abilities are unparalleled. In the past they presented an insurmountable threat to the Golden Age military, along with (more than likely) the Warmind Charlemagne. They have (on the large scale) gone toe to toe with Rasputin, and even managed to assault Oryx's Dreadnaught [i][b]BEFORE[/b][/i] the vessel's superweapon was disabled. And again, these are just the run-of-the-mill regular invasion force guys, the troops sent by the Empire on just another routine invasion. Buckle up Guardians. The Cabal Empire is about to put their tryhard pants on, and actually pay attention to our little corner of the universe.

Just unleash gorgons rip everyone

I have no idea why the Vex are winning. The Hive (Before all their accendents where killed) where hands down the most powerful race. In the Books of Sorrows, Crota accidently let's the Vex into Oryx's netherworld and they went at war for hundreds of years. Once Oryx returned from communing with the deep and seen the Vex in his Throne Wolrd, he took out all their army's and turned the Vex against one another. He even look the lead mind at the time.