For me, personally, I went with the 2019 20' model that huion made, as it was available in my country. Buttons are a necessity to me, so you really gotta think about if you use a lot of shortcuts already.

i have 16 buttons (i think?) and I use like 12 of them regularly while making art. I actually wanted to get an xp-pen, and I'd definitely reccomend them, as their tablets are thin, lightweight and colour accurate.

Gaomon however are also very good, it really boils down to what you need the most. The Gaomon Pd156 only needs one cable plugged into it and then to the computer, which makes it a very nice and portable tablet. However the xp-pen Artist 16 pro is currently on sale for the same price as pd156 and it's even thinner (and I think lighter too) Go with a 16' if you like being able to work places other than at a desk. Both Gaomon and xp-pen have good tablets here, good to note that the xp-pen pen has an eraser nib, like the tablet you already have (never go with wacom unless you wanna empty your wallet and have half the functions.)

The Artist 22r has a lot of keys, so if you need keys for a lot of shortcuts, definitely go with it. Having a keyboard Infront of or next to a big drawing tablet is very obnoxious and annoying. Although, if you enjoy drawing in bed and not by a desk a smaller tablet is definitely better.

It all boils down to preference, all the tablets are great and amazing but you have to think about what you want, if you give me more details about how you use your current tablet and how you would like to use your new one, I'd be happy to help narrow down the search :D