Here's the big delineator, which one does the wife like best
If both are equally liked by the two of you then I'd look closely at the dealer specifically at the dealer's service organization. We've learned the dealer makes all the difference when it comes to customer support.
Personally I like the Cougar floor plan. I believe the Cougar comes with the 4 point leveling system as well. We like the wardrobe slide in our Cougar and it also includes a separate linen closet. The shower looks to be larger in the Cougar too.
I'd recommend spending some time sitting, looking and walking around in both. Your previous experience with your TT will serve you well in determining which floor plan suits you best.