PS4 so I can play it at a higher resolution, and plug my headphones into the controller. That and the case will look nice next to KH3.
Ultimately, also, I'm sort of 'boycotting' my Switch lately. Nothing crazy, but Nintendo has settled into that awful groove where they have a lead and a few good titles and stop delivering beyond them. Animal Crossing is good, but between that and Paper Mario, Nintendo has failed to release any fun, skill-based 'core' experiences in 2020 and they have nothing on the horizon except for Zelda, which is likely very far away still. This absence of titles isn't even because of the pandemic, either. The real pandemic drought will happen next year. Nintendo had nothing planned.
So while Kingdom Hearts on the Switch sounds appealing (I'd have loved 1.5+2.5 more than anything) I can't go for it right now because I'm just burnt out on my Switch.