Addiction Venison & Apple wet is their absolute favourite. I try to mix it up on the wet stuff. I buy Evo and GO as well to mix it up so they get different textures. There is a new food my holistic pet store sells: Ziwi (from New Zealand). They didn't care for it at first so I haven't bought it for a while, but supposedely is as good or better than Addiction. Now, that I got Dusky eating wet, I may try the Ziwi again. For dry (and it's only given if I am a night away or as a treat...) it's Addiction dry only.
I feed a variety of brands, even now that Jamie is eating Rx food. He usually stops eating a brand after a month or so, and you never know when a particular brand may become unavailable.
We stick to one brand with the dry. But with canned, we vary the flavor and the brand every day. That way they don't get picky in the type of foods they eat.
It's the same dry food all the time for my cats. They're too sensitive to switch it up and it's the best one I've had (plus it's a special one for my boy who had a urinary problem before) . As for wet food, I don't feed that to them. They've never had it in their four years of living, so I'm terrified of what it will do their the bowels and the such D: I mean, if they can't handle a mix of dry food, just imagine what wet food would do Dx
I never used to chnage my cats food. My old cat Tashi lived on dry Iams her whole 16 years. But after I started researching cat nutrition, I've read that its better for them to have some variety, and the cats seem to like the change.