Blackfire Midnight Sun and Wolfgang Fuzion are both hybrid carnauba waxes. This means that the they are carnauba based but have polymers added to them for extra durability. I have seen a solid 2.5 months out of Midnight Sun and have seen others get a good 3 months out of Fuzion.
Blackfire Wet Diamond is a polymer sealant which gives it greater durability, up to 6 months. But it doesn't give that glow like a carnauba does.
I highly recommend Midnight Sun because of its ease of application and removal, plus the price isn't too bad if you ask me. You can get plenty of applications out of one jar.