mine are pretty good with dry food, they like Iams (adult multi only), gocat (Indoor cat only), and asdas own brand (so far all flavours), but i must keep changing between these otherwise they will turn their noses up.
Wet food is worst for me. They only eat felix pate foils, asds pate foils or the mini gourmet tims that cost a fortune. Thought I was on to a winner with the cheaper asdas own, but they will only stomach them for a short while, as wiuth the biscuite, then i have to change up again.
They wont touch whiskas, Kite kat or a number of other cheap brands.