Many like the Heinie, some like Novak, some like something else...
It's like who makes the best Magazine, beavertail, the best barrel, or even the best gun... Very subjective, based on who you ask...
Heinie definately has an edge, and provides one of the best sight pictures of the fixed sights currently produced, but some people simply like the profile of the Novak.
Best thing I can suggest is to try a few out, if you can rent, or borrow a friends gun who has the different ones mounted, and see which you like.
I have shot most of them, but one I have yet to try, and feel like looking at closer is the Wilson, YMMV.
Good Luck.