Best vendor to sell cooked fish to?

I know Jimmy buys bulk for 50% increased price. But Ted Selly buys for 2x, and Sheila buys on occasion for 2.5x but it's uncertain when the item she'll buy is the one you're trying to sell. Should I essentially just wait for Ted Selly to sell cooked fish to for the biggest profit? OR do I keep fish in fish form to sell to Max during a fishing competition for 2.5x? I'm unclear which is best/most worth it. Thanks!