IMac 20 and 24" Display Question

What is the difference between the 20 and 24 inch display?
I understand a difference may exist in that the 20 inch is a TN and the 24 is another type display. This is new to me.
Can someone offer a brief explanation of which is a "better" display? I am not gaming and am not a pro user but want the nicest display possible.
If both are benchmarked the same, then the tie breaker would be the display. IS bigger better?
Thank you.

My wife & I debated the $300.00 difference, & we finally decided to go for the 24". Great decision. The display is huge & gorgeous. I have a 20" iMac G5 at work and it now seems small. We did, however, decide that the extra cost for the 2.8 ghz was not worth the extra cash, so we went with the 2.4. No freezing, artifacts, or anything else (so far).
DEFINITELY get the 24" - you will be thrilled!
B. S.

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