[Water Warrior 2]

The GZ is the largest of the 3 bikes and would be more comfy overall. Having ridden a Yamaha for a week in a training course I would opt for the GZ. Lynda rode a Rebel during the training course and it had the common tranny flaw in most Rebels. They don't like to be shifted down into 1st when coming to a stop. A simple design flaw but an annoying one and also a dangerous one in my opinion.
The GZ has the virtue of 1 cylinder and fewer moving parts. A slick tranny and a truly forgiving personality. There are more Rebels out there overall but the GZ is the best in my opinion.