Rightly or wrongly I've never gone by what't in the food just if the cat likes it.
My 1st cat Tibby lived to be 26 and she only ate pilchards in tomnato sauce.
Up until Smudge went missing and then I found him dead he always ate tinned tuna and he was 13.
Bonnie prefers Gourmet and I buy it cos I don't have to throw any away - she also has the odd sheeba and PAH own make and Aldi own make but I throw some of them away.
I tried Bonnie on the new Whiskers Grilled the other week and it looks like Gourmet and she ate every bit of that - I got 10 boxes at Asda while it was £2 a box - now it's about £3.80.
I bet you spend more time down the pet food aisle in the supermarket than anywhere else
Good luck.
Mary