Well here is my 2 cents. The biggest thing I consider when looking at RV's is the sleeping space. Our first one was a class C. It was okay when it was just the 2 of us, and still okay with 3 of us but after it became 4 of us there was no way. One thing I hate is having to make up beds each night so there was no way I was going to have a kid sleeping on the couch and having to make and unmake it each day. The other issue was the queen size bed in the master bedroom. Camper queens are not the same size as regular queen beds.
Our current RV has a king size bed for dh and I, which we need cause we are used to sleeping on a king size at home and we were driving each other crazy on the old queen sized bed. It also has twin size bunkbeds for our two girls which I love. I prefer having dedicated sleeping space and that leaves our couch free. It also has an electric drop down bunk over the front cab which we currently use as a playroom but can also be used as a bed with a blow up mattress.
I see that your kids are probably old enough to make their own beds up, but consider how that is going to go before you settle on a floor plan. With making and unmaking their own beds you are likely to have sheets and pillows and blankets thrown all over the place when the couch gets turned back into a couch and stuff like that can make a camper feel very cramped very quickly.
Another thing to look for is a big enough fridge. If you are going to be taking longer trips you will want room for food, especially with teenage boys I imagine! I wish mine had a bigger fridge, but I do all right since it has an outdoor kitchen with a second mini-fridge so I'm able to get by.
Both my mom and my aunt have Fleetwood diesels and they like them a lot. I prefer gas and have a 2014 Thor hurricane 34J. I love the floor plan on it, but I'm not crazy about Thor overall. We had a lot of slideout issues and we bought ours brand new. I took a look at both of the ones you have mentioned and I have to say I'm not crazy about the floor plans on either one for sleeping 5 people but that's just me.
Last but not least, one thing to consider is bathroom accessibility when the slideouts are completely in. Being able to use your own bathroom while on the road is the BEST THING EVER!