Aside the other positives others have mentioned for F, there is one that is quite unique to the 77W F on AA. The seats swivel so that those seated in the middle section can face each other during meals, or anytime for that matter, which makes for a nice, rare experience when flying.
Hopefully Flagship First will be brought back to provide a difference in the F&B offerings compared to J, and a somewhat upgraded bedding. Of course it would be an extra bonus if FFD was also reopened for Int'l F AA flyers.