You will probably get as many different opinions as there are forum members on this one
You really have to go for what works for the type of camping that you do and the floor plan that works for you. Also what else is important to you - mpg, outside storage space, holding tank capacities etc etc.
4 years ago we went from an 80s 27' A class to a one previous owner mid 90s 38' diesel pusher. No slides but we have plenty of room for us two. As we bought an older model we could afford to buy what was top of the line back then, great build quality, solid oak cupboards, cedar lined closets etc. We also love the extra basement storage space & bigger holding tanks as we mostly boondock.
If a unit is in good shape don't be afraid of its age. Good luck with your search.