Ron, we have a non-slide coach and we are happy with it, having said that we have also been in Gary and Peggy Stevens bus with the slide extended and it is VERY ROOMY and a very tasty coach on top of that.
Our bus is an 86" floor to ceiling unit and it has a little different feel. Most XL's are 83" floor to ceiling. Just something else to think about.
This is really a question of how you plan to use the bus and personal preference.