Oled SD vs Rog Ally X

I had the oled SD but had to sell it when money was tight; I’m in a better place now and looking to get a handheld again. Price isn’t much of a factor and I basically only ever play in my house, so neither is battery life.

I know how the SD is basically plug n play, super simple, but can’t handle modern AAA games, but can the Ally X? Also, I always had an issue getting external K+M to work while playing games on the SD— can you have an external K+M and game on the Ally X?

Also, how is armoury crate on the X? I recall the OG Z1E having a lot of issues with it/just being a headache. Has that gotten better?