Thor ACE 30.2 vs Forest River 31B3

We have the 30.2 and love it. We travel with our 3 grandkids and 2 dogs and the motor home is plenty comfortable. Our requirements were similar, under 32 ft (to fit in our driveway),needed bunk beds, and needed to be fully functional with the slide in. We liked the Thor floorplan the best--especially the table for the captain's chairs, and the swivel function allowing the chairs to be part of the living area when parked. Kitchen fully functional when slide is in, as is the bathroom, so we can park and dine without leveling and moving the slide in and out. Little things like the under step storage, the shoe bin off the steps (while not called this in the literature, if you've got three kids you will understand exactly what I am getting at!!!) The ability to keep the "princess bed" over the can extended without losing the use of the captain's chairs were big sellers for us. Performing the cheap handling fix, adding a safe-t-plus and a rear track bar have it handling well in wind, rain, and high speed conditions. Consider those add ons as part of your purchase price.
We are currently preparing for a 3.5 week camping trip out west with the kids. If you have additional questions, or want specific advice on add ons and modifications please pm me.
Good luck with whatever you decide to do.