Don't have a clue about the monitors in question but the monitors will run at the same resolution so the only thing to gain by kicking it up to 22" is a bit more screen size, so good for watching movies etc. If you're just sitting in front of screen playing games/posting on OCUK forum then 20" might be preferable for you. As I say though, I'm not comparing the particular monitors, just generally comparing 20" and 22".