A couple of advantages of a fifth wheel over a TT that I didn't notice mentioned: For a given length of RV, the fifth wheel gives you more livable room than a TT. This is because the TT has 3' or more of non-livable space -- tongue with propane tanks and battery(ies). For the fifth wheel, that space is livable space.
Also, when hooked up, the livable space of a fifth wheel is farther forward than in the TT. So the length of the rig is less with the fifth wheel compared to the amount of livable space. This can be a factor when maneuvering in tight spaces in gas stations and so on.
These are factors for us, as moving to a fifth wheel will allow us to fit an RV with more livable space in the parking space we have at home, by owning a fifth wheel vs a TT. And, the same principle applies when camping -- with a fifth wheel, I can fit an RV with more livable space in a tight space in the 5th wheel form than in the TT form. For this and other reasons, we plan to move to a 31-33' Fifth wheel from our 28.5' TT in the next year or two.