I personally like the 2013 rear end better so I say 13. Looks are subjective though. If you like the look of the 14 get the 14 as it is newer.
I would think the deals should be better on a 13 but have not been looking at pricing since I bought mine. I got supplier price on a 13 last summer so seems like should be able to do better now.
2013 ZL1 (president of the tangent oregon trophy husband association, founding and only member)
2013 Megacab 8" lift 38"mt's