PS5 by default. I am just too invested in the Playstation ecosystem.
But I will try and say something unbiased...
In for the games, and I am more excited about what they are doing with the controller. I feel adaptive triggers if done right/what I think they can be would be one of those game-changer type things (like dual analog sticks and rumble). And we would be seeing controller revisions from both MS and Nintendo with the tech inside them.