Ya that's like asking what the best car is and why! Case dependent
But a couple things that are universal.
A varied diet is always good. Feeding them just flake or pellet or just one kind of frozen is not as desirable as a variety
Supplements like garlic and selcon should be added to almost any food!
I personally have a big tank with a lot of fish and a lot of SPS. I go to the chinese market and buy a bunch of fresh seafood (squid, fish, shrimp, clams,etc) , get some PE mysis, some various frozen cubes, some nori, spirilia powder and throw it all in the blender.
I don't directly or intentionally feed the corals at all.
