Too many viariables.
What kind of food do you enjoy?
What park will you be in that day?
I enjoy both and have not had a bad meal in either.
If I am at AK, Tiffins is a given. Would I make a special trip or ticket if I didn't have a park hopper or AP? No. The menu is still very good, but not as unique and interesting as it used to be.
If I'm at HS or EPCOT or a non park day, Flying Fish is an easy option. Their fish is very good, haven't tried thier steaks.