Advantages of a TT are flat floor, lower to the ground, less wind resistance when towing, lighter, full use of truck bed for other things, and often less expensive unless you opt for the Airstream.
Disadvantages of a TT compared to a FW are that TT's often are
more 'recreational' than 'full time,' sometimes less outside storage, longer overall since five feet or so of the fifth wheel is over the truck bed for the same length of RV, typically less headroom inside, and sometimes smaller tanks.
But, we can't decide for you, that is your issue.