In regards to which is 'better' is, as you've already stated, a matter of opinion. I bought my 2013 2SS/RS new at end of the year, after the 2014s had come out. I looked at them side by side and test drove both. IMO, there is little difference in performance, so it really came down to overall looks. I personally like and think the 2010-2013s have a more aggressive, 'muscle' car look then the 2014-2015's.
Go out test drive and compare both, then select the one you best, you can't go wrong either way ... good luck in your search
