Having only used Klasse and not Zaino, I can't say which is best for you but I can say that Klasse AIO/SG seems to be very durable. Easy 4 months of beading and decent slickness on a black BMW X5 that isn't regularly garaged (their original garage was converted into a game room and the garage they added on is real tight for two vehicles). It probably could have gone much longer, but the owner wanted it waxed again (Wolfgang this time...which at 3 months is going strong still).
I think if you use the Klasse twins, add a second layer of SG a week later then a week after that, go over the car with #16, you should be pretty well protected. Maybe on a warm day in January or Febuary (you know, when it gets above zero!), add another coat of #16.
I think if you use the Klasse twins, add a second layer of SG a week later then a week after that, go over the car with #16, you should be pretty well protected. Maybe on a warm day in January or Febuary (you know, when it gets above zero!), add another coat of #16.