As with all fish it depends on the location, water temp, time of year and the finicky fish.
For Fluke we have a great deal of success bouncing bucktails or Hopkins off the bottom early on...then it is pretty much Kellies and Squid and sea robin strips, then for the door Mats we use Snappers, Peanut Bunker and Artificials with shedder crab sent.
For Sea bass, clams, squid have been the main stay as well as sea robin strips
Fluke bellies used to be the best, but alas times have changed
One killer rig we use for fluke is three dropper loops from 8" off the sinker spaced 4-5" apart and hook a Kellie to each one...looks like a mini school and the FLuke jump all over it