We looked at the XL and you don't seem to get much more for the price difference. I certainly appreciated the upgraded dinette with drawer storage, the bigger chassis with big garage doors, and higher ceiling, but was neutral on the ceramic floor. The decor also felt better suited to my grandmother.
The 364TS had a generous array of equipment but what clinched it for us was the great floor plan and 2 full bathrooms. I have 3 lovelies in my life and the teens certainly need their bathroom time.
Everywhere I looked I was either surprised or satisfied with the equipment level. You get a lot of bang for your buck in the 364TS.
I have seen several threads of people agonizing over whether to go with the 351DS (or XL equivalent) or the 364TS. I think everyone of them chose the 364TS.
In terms of quality, I like some things on the Tiffen and some on the Georgetown, but 30K? Tiffin HAD a good service reputation but they seem to be slipping from what I read. Georgetown has a mediocre reputation at best but based on my recent experience they are making a concerted effort to improve that.
In the end it really depends on if you are travelling with kids. If so, 364 all the way. As to quality, I have owned a Starcraft, a Cruisers RV (fantastic product and company by the way), and just got the 364TS, all in the last 4 years. I am tremendously disappointed with the build quality in all these units when compared to current cars. What keeps me sane is thanking of them as projects.
They are all EQUALLY bad. Now that thats out of the way, enjoy your GT should you choose to get one.
2016 Georgetown 364 TSF
2015 FunFinder 242BDS traded for above
2014 Starcraft 1221 Comet traded for above