In my opinion, I think both but if I had to choose, it would be the Xbox s because you can get all the PC games on there and they have more exclusives like game pass and warzone. But really its up to you.

In my opinion, It would be the Steam Deck as it's basically a computer because with a dock, you can connect it to a monitor and use the deck as a controller. Speaking of controllers, the SD can connect different controllers.

For the PS5, I would wait for the slim to come out.