some are built better than others. the best way is to just go out there and look. check out the cabnet construction , the finnishing and every detail. we went with a cougar because we found there were some better build qualites in the interior, but every unit will have some issues.
the second best thing to do is take your time to find the floorplan that works for you. there are hundreds to chose from, check out things like can you pull over in a rest stop and have a nap with out putting out slides, can you access the fridge or washroom, with out putting out slides, is an outdoor kitchen on the wish list... there are so many option and features, just take your time and enjoy the looking.
Steve