Ah, didn't state that clearly?
They're the same, just need a little force to do it, very easy, of course I assume you don't do it frequently? Might worn out the stopper and become loose after sometimes, but I haven see any problem with this type of stand so far.
Added on July 15, 2012, 7:19 amDepends on your budget and resolution you want to get.
If you can sit further away then bigger the better, some people wants 27" 1080p.
I have a 23" 1080p and I don't see any visible pixels, and I'm sitting 2' away so PPI doesn't matter here.
If you're seriously about PPI then wait few more years for the PPI to get even denser, Intel predicted somewhere next year, 23" might get 3000x2000 or higher.
Look at Apple latest MacBook Pro, a good start.
Bro if i use to game only? sit near. Really need 22 inches that big?
21.5 aka 22 = full hd.
20 inches = 1600x900.