22" vs 20" Widescreen LCD

Hello,

I did a search and it didnt return anything.

In any event, I am looking to hook my 360 via VGA  up to an LCD monitor. I am looking at a 22" widescreen and a 20" widescreen.  Both have the same resolution (1600 something x 1050), same response time, same brightness et cetera.

I read that when using two monitors of the same resolution but different sizes over VGA, it's better to use the smaller screen (in this case, the 20" widescreen) as using the bigger screen can cause pixelation or something like that.

Now I am not so technical to know if this is true or not and why, and I was wondering if anyone out there can tell me if this is true, whether or not there is an advantage of using a 20" over a 22" in this case of same resolution monitors.

Thanks alot for your time.

-Mike