You here (It will fit where we want to camp) and that is the key. Where do you want to camp? I have a 26' TT and went to 2 campgrounds last summer that I was to large for. They were old campgrounds in very scenic areas (lake shore). They were geared for popups and truck campers or under 20' TT. There was another campground in the area that you could park a 5th wheel but not anywhere near as scenic.
How you use it is as important as well. Some only use the camper for a quick meal and to sleep spending most of there time outside. Others are just the opposite.
It's impossible for any of us to tell what's right for you. That's why they make everything from tiny campers to 43' 5th wheels (size of a semi with truck).
Remember you have to drive the rig as well to the destination and what are you comfortable with?