Bill & Karen,
How tall are you? 16' specs: interior height 5'10''. 17' interior height 6'1-1/2". I'm 6' and would never consider anything with a shorter headroom than me. Years ago I looked at a short ceiling RV and got a crick in my neck from just the few minutes I was inside. That made up my mind then that if I ever bought anything I was going to be able to stand up like a homo sapien and not have to make like an ape. Recently, in Yosemite, I met a new (to him) 16' Casita owner and on seeing mine he said was going to sell his and get a 17' model so that he could stand up straight when inside. It could be the difference between loving and hating what you own.
PH2
we just short folk and that is why I didn't mention height, I could fit in either but my wife loves big refrigerators and hates bugs so that is why the 16' would have been out for us