Both of these characters are at the height of their power. Thanos has the gauntlet with all stones and his entire army. Oryx has his entire fleet and his entire army, as well as the abiluty to take. Assume that powerful entities (Thanos and his children) can not be taken. All else goes.
For sake of argument, there will be a bonus match up in which Thanos is lacking the space stone. All other rule apply.
This is my response:[spoiler]Oryx wins. Thanos may use to his infiny gauntlet with all stones to snap all of the hive away. This is allowed, because the stones command the 6 fundamental laws of the universe. I say that this does not work on Ascendant hive. They are paracusal, meaning they are above the laws of the universe, meaning thwy are above the stones. Oryx can then use the dreadnaught cannon to make all sirvivers part of his throne world, and do what he wishes with them.[/spoiler]
Feel free to argue your vote in the comments. Also please don't talk about Thanos in comics. Thanks and have fun!