Personally, I like both systems. Some of my boats have Mike Yee, some have Mohawk. A big advantage of the Mohawk is it's really easy for someone else to hop into your boat and adjust the outfitting to them. For the Mohawk, I recommend the double strap thigh retainer system.
The advantage of the Mike Yee system is that it really does a great job of gripping and holding down each thigh separately. You have a really great sense of boat control.