Well, I have never seen either case up close. But some professionals I trust rave about the Macus Bonna case. They have been the case to have for years for the french horn player. The quad case looks terrific. And an MB case just cannot be beat for quality and a thought through design.
www.slidebone.com, a TM sponsor, sells them. Irvin is a real nice guy and a professional player in NY. You can see them at
http://www.slidebone.com/case.html#MB
Perhaps Irvin will log on and answer your questions. But I can tell you, every time I see the MB cases, I have a problem with "coveting."
Jim