Originally Posted by
PraisCthulhu
Elemental has the advantage of having the exact same stat weights as Resto, just with a lower mastery breakpoint. So you'd probably already be pretty optimally geared for Ele. As far as which is better in NH, there isn't a clear answer. Last I looked, overall, Enhance parsed higher. However, there are fights where Ele is head and shoulders above enhance, and even the fights where ele is behind, it isn't usually by much.
Overall though, they are close enough that you should go with the one that you prefer the play style of. If you like the play styles equally, go ele for stats.