I was taught to always feed as close to live as possible. Given the choice hands downs I would feed frozen mysis. The freeze dried is often my choice over pellet or flake for my pet sitter to feed, but frozen often can be enriched and I like that feature daily basis. Yes, frozen needs to be defrosted and rinsed most of the time, but freeze dried need to be rehydrated and rinsed too, so you are not saving much time, if any. Good luck!