It is very hard to know what features you will love, and what features you will hate about a given coach going into it, what I can tell you is that features that you thought were key will turn into features you don't care about a year or two down the road and things you never considered in your purchase will be things that go on your must have list for your next coach. There will also be things you learn to hate about whatever coach you buy, like that $#&@! cabinet door you repeatedly hit your head on.
Let me give you a random example of the sort of thing first time RV buyers don't consider, lets limit this to cargo compartments, do they have side or top opening doors, twist lock, slam lock, or key cam lock locking, do they have central locking / cargo bay lighting, roller trays, etc.? What is best, who knows many people prefer side opening cargo doors with slam locks, some people like central locking, which can be great until it does not work right. My coach has top hinge cargo doors and key cam barrel lock, I might prefer side hinge on a coach in the future, but for me this is not a show stopper. More important for me are things like a insulated heated wet bay for colder weather operation.
A couple of other things here, don't fixate on the things that are relatively easy to change, ie don't discount an otherwise great coach due to it having ugly curtains or a uncomfortable sofa, as these things can be changed for a small fraction of the price you will be paying for the coach.