I’ve played the Alphas + on PC and when the game released, I played it on Xbox One. At the release there were some minor bugs I encountered, such as texturing issue or two and models not being where they should be, but nothing groundbreaking at all or game breaking. Nowadays they’ve fine tuned it much more and it runs well. The only complaint I think is usual now is that the consoles and literally anything can’t handle the CPU requirements to load in a complex location like a large town or something quickly enough, but it will eventually load regardless, but I can’t verify this as I haven’t actually played it in a while due to my degree.
Also, with the Royal Edition, this is the best time to buy into the game as it includes all the DLC which even backers (including myself) don’t just get for free (I wish we did!) Either way, Xbox is probably the safest bet for performance, it’s meant to run on them, but PC wise, unless you’re running with a great machine, you’re gonna suffer a bit; expect a triple A game specs.
So my vote is for Xbox game.