For a cintiq, you just need to calibrate the pen for how you work. Might take a couple of tries to get it to feel the way you want. I don't pay attention to my pen tip, I just "feel" where the cursor is. It is pretty accurate though.
The screens are slick, but wacom has felt nibs that have a nice rough feel and grab like a pencil would on paper.
I worked on a 12wx cintiq for years until my pen broke. I bought it used (several years old already) and 7 years later it still works, I kept it in case I find a deal on a compatible pen.
When the pen broke, I had a big job I needed to get done, and couldn't find a pen, so I bought a new old stock cintiq companion 1, pretty much the same size as the 12wx. The calibration was better, no jittering towards the edge of the screen like the 12wx. I've been using this one for about 2 years now. The screen has heat damage now but still works, and I've seen others that complained their screen stopped working with excessive heat. So I don't recommend a companion 1 or 2 unless you do fairly light work.
I'd say Cintiq 21ux 2nd gen and up are the best.
I would trust used wacom, but not used other brands.
The x-pens have fairly good reviews and a friend of mine has a 21" that she loves. Great prices, and if there is an issue they seem to have pretty good customer service.