I had the mahi mahi in Dec. and couldn't finish it because it was really rich. I'm not a seafood person though and really couldn't tell you how mahi mahi should taste. If I went back again I would choose the filet over the mahi mahi.
THose are my two favorites on the menu - so you would be good to go with either. I prefer the mahi mahi because i love the mushroom risotto it comes with.
I vote Mahi Mahi - it's my favorite. The filet is good too but the Mahi mahi- ah heaven on a plate. And I don't think the fish is heavy it is the risotto- but that makes it goooooooood.