TDO Chromaboost are my go-to pellets. I've been feeding those the longest, and all my fish seem to love them, but it's not the only pellet I feed.
In my smart feeder, I keep a mix of several different pellets. I use TDO Chromaboost, PE Mysis pellets, NLS Thera-A, and NLS Ultra-Red pellets. Some float a little longer than the others, some sink quicker, some seem to say suspended a bit longer. Having a mix seems to get pellets to all levels in my tank and all my fish manage to get some.
Saying that, I mostly feed frozen foods. The pellet feeder is only for when I can't feed them frozen.