Pros and cons to either choice, both can be had with 4 season capabilities including heated tanks and both can have the option of powered stabilizing/leveling jacks.
Not in all cases but fifth wheel rigs usually require a bigger tow vehicle due to their pin weight which puts you in 3/4 or 1 ton truck territory, especially if you do decide to get one designed for extended or fulltime RVing.
Floorplans between the two are becoming evermore similar over last few years but fifthwheel rigs tend to have more abundant storage although TTs are catching up on this issue.
Other variances are if you want to have your truck bed totally clear and if stairs might be something you may find troublesome now or down the road.
How the rig tows down the road causes many to also consider the type of rig they want. Take your time figuring out all the pros and con of each.
Good luck and here's hoping that the rig you choose is all that you expected and then some. Happy future camping and many thanks for serving our country!!