Protheans were the first to master FTL travel with the Mass Effect Relays, and leaving them throughout space basically allowed any alien race after the Protheans to utilize FTL travel as well. This allowed for many alien civilizations to boost their technological prowess and ultimately led to the Citadel and alliances between many alien races. The impact of Prothean tech was massively profound. Without the Protheans we wouldn't even know about the Remnant. Remnant tech seems to be less influential, seems to be a similar system spanning multiple galaxies but the implications are nowhere near as wicked. Outward looks imply that remnant tech was still heavily advanced and can alter not only ecosystems but entire planets to suit the needs of whoever built the systems. I'm not quite done with the game but I am aware that there is a bit more to the Remnant and their tech. Probably more destructive in nature than altering planets seeing as the main antagonist of ME Andromeda wants to harness the source of the Remnant vaults. Reapers aren't a fair comparison at all, they wipe out all sentient life in the Milky Way every 50,000 years lol. Doesn't matter wh you are or how many ships your fleet has, you can't beat them. Edit - to be a bit more clear, the ME Relays were technically traps left by the Reapers so that they could have more civilizations to kill every 50k years. Protheans kind of gave them the kick they needed though, made them easily accessible.

I can understand why that was said about Remnant technology, it being less advanced than Prothean tech. I think it has something to do with the fact that even though the vaults do incredible things it's like comparing an air filter vs a super computer that teaches you about FTL travel. The air filter is amazing, but it's still just that, while Prothean tech advanced human civilization thousands of years. We also don't really know what Prothean tech was like at the height of their civilization. We've only seen glimpses of Javik's memories, which were were pretty much only of the war against the Reapers and advanced Prothean tech was pretty much long dead. Secondly, the Prothean ruins encountered in the game are at least 50,000 years old while that Jardaan tech is 300-400 years old. Hard to compare ancient ruins against abandoned buildings.

It's hard to say given that we know so little of the jardaan, but I think it's safe to say the reapers are far more advanced. Prothean tech is just reaper tech, so that's kind of moot.

Jardaan may or may not be more advanced technology wise, but mentally they are way more advanced than reapers since they use their abilities for good and the creation of life.

Well, the reapers never tried to terraform or something like that, but I believe that they are more advanced than the remnant, my opinion might change though, the jardaan left the system (at least that's what I could understand from the meridian mission) so we don't know much about of what they are capable of, all we know is that they're terraform life creators that disappeared after the scourge

Mass Relays