For 12 years I drove coaches for entertainment, VIP and corporate clients. I've driven Prevost XL's and H3's as well as MCI's, Van Hools and even Eagle coaches.
The number one choice for professional drivers is the Prevost XL series. Second is the H3 and third is the newer E or J MCI coaches. All three drive and ride very well because they have a real bus chassis.
If you have rooftop AC units on any of them, clearance and side wind disturbance are both concerns. The XL would be lower and probably one of the bigger reasons pro drivers favor it. If you live in a typically high wind area of the country like California, an H3 with airs may change lanes on an interstate if a side blast is strong. That takes a lot of the fun out of a vacation cruise.