My vote is the 5th. wheel for the following reasons:
1. you already have 5th.wheel experience, so no learning curve.
2. A 5th. wheel between 25 and 30' in length with one or two slide outs will make a world of difference to your living style needs.
3. 5th wheels are generally more stable when towing down the road. This is not intended to suggest that TT are less stable. I have driven both and currently have a 34' 5th. wheel.
4. 5th. wheels are easier to load and unload in comparison to a TT. Yes there are some a few instances where the pull handle on the 5th. requires a little coaxing. This usually occurs when the site is uneven. The TT can also have difficult moments when the trailer hitch and ball require some extra effort to disconnect.