It depends on what you're looking for. If you want protection, you could try Klasse AIO/SG, Zaino, or Blackfire. Each of these products will last much longer compared with a carnuba.
If you like the carnuba look but don't want to wax as frequently, One Grand Blitz Wax has a great reputation for durability. The major disadvantage with Blitz is that it stains black moulding.
What it comes down to is how often you are willing to wax (time and frequency), and whether your primary focus is on protection or shine.
There's a wealth of info on waxes. Try doing a "Search" on wax or look through the "Reviews" section of autopia. The e-book also has a great chapter on waxing. (The wax chapter is included as one of the free chapters.)
Good luck,
-ema