I mean personally, I am loyal to the Xbox to a certain extent because that is what I grew up playing and I'm already in the ecosystem since I have two more years of Gamepass Ultimate, I am a fan of the games on the platform, and I already have the controllers to be able to play a 4 player game of Zombies on BO5 or Slayer on Halo Infinite on Series X day one, and right now I see no real reason to buy a PS5 at launch since the games I want to play will be on Xbox. So in that regard, I am loyal to playing on Xbox. But my loyalty to Xbox is more a move of practicality than anything else.
That being said however, I do have a decent gaming PC still that I use to play a lot of games and I am also more than ready to buy a PS5 within the next few years especially if its backwards compatible with older games.
Additionally, I feel this is a stupid question to ask, because I feel like everybody has a preferred platform to play their multiplatform games, and barring some major fuckup, that is most likely going to stay a given person's preferred brand as time goes on and generations change