How big a difference is there between a 20"/20.1" and a 22"?

In a widescreen, both the 20" and 22" have the same resolution. They will be similar except in size.

I know they have the same resolution, but is there any reason other than size to go with a 22" monitor over 20"?

no. only difference is the size. it is a personal choice to select 22' over 20'.

20" will have sharper resolution... smaller pixels.

All 22" LCD uses 6-bit TN panels which are considered inferior to the slightly more expensive 8-bit P-MVA and S-PVA panels, and the more expensive 8-bit S-IPS panel. If you are a gamer and do not require good or excellent color accuracy, then a TN panel will fit you nicely.

20"/20.1" LCDs are a mix of the above mentioned panels.

Finally, someone mentioned a crticial difference   Hose, shame on you for such a hasty post(s)..  

Fyi, 20" WS has a dot pitch of 0.256, 21" has 0.269 & 22" has 0.282. In comparision, a 19" (5:4) has a dot pitch of 0.294 and a 20" 1600x1200, 0,254.

Of course, those numbers don't mean much unless your typing this post on one of the above, in which case, your best bet is to go to a large electronics store and comapre them with your own eyes. Such stores usually chain a bunch of monitors to one workstation running a demo. I deons't get better than that for an A/B comparison  

"...Hose, shame on you for such a hasty post(s)..  

Pardon? Perhaps you confused me with someone else...

No, I didn't confuse you with someone else. I was just teasing you because I (normally) consider your posts on this forum as reference material, but less so in this particular thread... :wink:

No, I didn't confuse you with someone else. I was just teasing you because I (normally) consider your posts on this forum as reference material, but less so in this particular thread... :wink:

Oh quit it. You sound like my freakin' wife~ For the majority of 20" widescreens and 22" widescreens, the differences are overall size and pixel size. Nearly all of both sizes still have TN panels.

He mentioned "[comparing] in his price range", so obviously he's not talking about a $600 20WMGX2.

thx for the compliment