Probably not a big difference, at least as far as looks go. My advise would be to try it yourself, as everyone has their own opinions when it comes to "looks"!
EX may have a little more depth, but EX-P/Natty's will look a little wetter. Is there a whole lot of difference? You'll have to decide for yourself. Some people can't see any difference between EX and EX-P. For other people, the difference is like night and day.
As discussed over at Autopia, EX vs EX-P on black is slightly subjective, but many feel that EX-P's clear wetlook accents nicely with sharp lines, where EX looks better over a more rounder surface.