Both the tunable ones and the older glow or black ones work. I found real bait works better unless there are lots of dogfish, then you will keep your gear in the water longer and catch more salmon using baitrix. That said, if there are lots of coho around, they will eat lots of different things; and if they are scarce wouldn't real bait be a better bet? It is fun to try new things, and bait can be a pain sometimes. If you're like me you will amass a big collection of gear, including baitrix and dozens of heads to roll them in that you couldn't possibly use in a year let alone a day.
Last Sunday I went trout fishing with over 500 flies in my vest and used 2.