"Best" is largely a matter of preference. I have Novak 3 dot on one my 1911s and they work just fine. T'were I to get new ones, I have discovered a preference for the Heine two dot ("straight eight") method; I find them quicker on target (if you're off, you'll be off vertically as opposed to horizontally on 3 dot type sights; humans are normally taller than they are wide).
Novak, Heine, Trijicon, Meprolight- hard to go wrong with any of them as long as you find them usable.