Just finished trying the demo, first on Series X and then Switch 2 (docked).
Switch 2 is seriously impressive. Apart from Diana's hair and visibly lower resolution, the frame rate is solid and you ain't missing anything during the action. No vaseline effect on a 4K TV, and one can happily live without the better lighting and reflections.
Not saying that you shouldn't go for the better version if you can, but hey, these internet comparisons are really a nothing burger once you've played the actual games. Now if every dev put in the same effort as Capcom...