My parents have a 38 foot fifth wheel and are downgrading to a 32 foot tt , because they stayed in mine. Personally I see lots of adbavtabes and disadvantages of both.
Fivers have
Storage
Exceptionally high celinings
Typically overall more room
Residental fridge
The tt has
High celings still. I'm 5"11 and there is at least three feet of roof
Easier to cool down, less space to cool.
A bit of an easier tow
More refined spaces. High end tt can take advantage of space better than a fiver imo
My parents are switching because it's just the two of them, and it's better for them. Personally I'd rather move to a fiver over a tt for the benefits of a cool new truck , also tt seems to not be as well built imo. Our floors squeek, there's do not. They have a legit master bedroom over the bed, my tt does not. My tt has smaller tanks there's does not. They have an on board generstor, ours does not. They have less storage than me though, which is fine because I have a half ton truck, I gotta be careful anyways.
Most importsntly though, is the drive. I have a six inch lift on my tt and it weighs considerably less than there five allowing me close to the same mileage they get and I'm gas. Tt really is more of a recreation and less living , a five is imo more liveable than a tt, simply because it has that in mind a bit more with the floorplans I've experienced / seen. Good.luck though!