Sealants are more durable than carnaubas. In real world sealants last around 7-8 weeks. Carnauba would be 3-5, depending on what carnauba you use, and your climate.
Please keep in mind that although sealants are more durable agains salt, detergents, and weather, - they are not very durable against bird droppings.
So, why not get best of both worlds - sealant and carnauba. I only used QuikShine from ClearKote, so I can't say anything about their waxes. I know for sure that carnauba waxes like DP Max Wax are not expensive, are very easy to apply and remove. And there is no need to wait for it to dry. Wax on - buff off. Goes on and off like butter. It will take on average 15-20 minutes to do it.
Good luck.