Which iMac is better? (late 2013 vs late 2015)

I am in dire need of computer help for Black Friday.

I wanted to buy an iMac, but am unsure which is better. I think it's the 2013 one, but I'm not sure. Here are the two contenders (found both for about $900):

option 1 Late 2013 iMac 21.5: http://www.bhphotovideo.com/bnh/controller/home?O=&sku=1006607&gclid=CKnU9oHbtMk CFc2Cfgod9wIIrQ&is=REG&ap=y&m=Y&A=details&Q=

option 2 Late 2015 iMac 21.5 (cheapest 21.5 inch on here): http://www.apple.com/imac/specs/

Isn't option 1 much better, even though it was released earlier? I found them both at a deal and need to know which to keep... but option 1 seems much better, and I know there are the same physical design.

The only possible way I can see option 2 being better is that it has a 'broadwell', instead of a 'haswell' processor. But I have found that that doesn't matter that much?

Am I right on this?

here is a comparison chart with them both on it: http://www.everymac.com/systems/app...inum-late-2015-mid-2014-late-2013-models.h tml

Thank you for any help.