For me, it's iPad (9th gen) since that's really the only up to date iDevice I have. The iPod Touch 5 is still on ios7, while the iPad Air (1st gen, came out in 2013) is on ios8. I do miss the high pocketability and portability of the IpT5, but over time, the screen just got too small for my preferences. Hard to go back from a tablet screen :\ Then there's the additional issues that the IpT5 and Ipad Air (1) are just behind spec-wise.
AA of course has to be on the iPad. For non-AA, generally prefer iPad as well. My phone (Google Pixel 4A) is a screen size that's overall small and narrow (2.7") which is on par with an iPhone SE. Some games on there are either unplayable, or a lousy experience. Until I upgrade my phone (probably a Pixel 6/6 Pro/6A), I'll minimize the gaming I do there.