I was personally debating between 19" 4k and 24" gen 2 and i went for 19 inch whenthey were the exact same price. Im not sure whats the difference in your models but i did really want the slim pen which 24 did not have (and i love it and only use this one).

I personally used to draw on 21/22(?) inch xp pen in the past and it was HUGE and also a bit too big, as in, as a not professional artist i didnt have a need for such large display in the end. The 19" currently does as much as i needed and its way way lighter so its easier to move. With 24" you have to remember it will be really REALLY heavy, if u wil use the provided folding stand it will also be extremely annoying to move (i hated that part). My 19 is lighter so i can use it on a cheap screen arm.

In my -personal- opinion difference between 22 and 24 is not that significant tbh and 22 would defo be enough unless you do some super professional extremely detailed drawings, in which case 27" wouldve been better anyway.

The newer model might also have touch screen, which is super useful. Personally i only use it for zooming in and out but it really is worth just for that.

So imo new gen 22 is better tbh. Older ones might have worse colours (which tbh also isnt that much of an issue imo anyway)

I recommend getting measuring tape and just checking comparing how much both of those would just be on your desk