Can someone compare these to imac please?

Im looking to buy a used Imac. Can someone please compare the two imacs for me please? Which one is better? Would be using it for music (Pro Tools)
For the 1st one here is the info I got for it.
Model number-MC511XX/A
S/N- W8*******5PE
whats a fair price for this and is it worth it to buy.
For the 2nd one here is the info I have.
Model Number- A1311 im not sure if thats right based of how many charaters
he also gave me this number 309lla
<Personal Information Edited by Host>

Introduced     July 2010
Discontinued     May 2011
Model Identifier     iMac11,3
Model Number     A1312
EMC     2390
Order Number     MC510LL/A (3.2 GHz), MC511LL/A (2.8 GHz), MC784LL/A (2.93 GHz)
Introduced     May 2011
Discontinued     October 2012
Model Identifier     iMac12,1
Model Number     A1311
EMC     2428
Order Number     MC309LL/A (2.5 GHz), MC812LL/A (2.7 GHz)

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