First game you're buying for either PS5 or Xbox Series X?
With my PS5 pre-order secure, I'm going to have to say that...I'm not 100% sure haha.
For me, Cyberpunk, Demon's Souls, or Spider-Man. Although the idea of getting Demon's Souls is amusing to me considering that it's originally a PS3 game. 2020 is weird.
So, I am getting the PS5 only for first-party games. Third-party are reserved for PC. Whenever I can get a PS5, which I don't have pre-ordered yet, it will be Spider-Man: Miles Morales. I love all things Spider-Man, so I can't wait to play MM and the remaster.
I think it depends on your preference. Both have different gaming features. Personally, I'd prefer playing PS5. I think there are more varieties and more features. It also goes down with the kind of game you want to play. Each game registers different depending on the gaming console.