I've been told that there are two key differences between Prevost and all other slides. Prevost slides, being done at the factory, should weigh less as they will be the only slide manufacture that has the ability to modify the structual cage in that are of the bus. Others will have to provide added structual materials in the immediate area of the opening. The other difference will be the mechanism and electronic control systems supporting the movement of the slide. Who's best here I have no idea. I'll add that I'm not a fan of fold down bay doors under the slides. I would prefer side opening doors that open to the front of the bus. Can you imagine what would happen if a fold door door accidentally opened while travelling...