"We have too much room in our RV" --said no one ever. :D
Really you're only talking 6 feet difference between the 2 you're looking at as far as towing it and backing it in. Ours is 38' and it's no big deal really. I can stick it where ever it needs to be first try. A 38' 5er will tow and back better than a 25' TT when you get the hang of backing it.
All that said.....is it just 2 of you? You may be just fine with the less space but, me personally, I will always take the space. I'd rather have and not need than need and not have.