I do a combination of both, now. Last week Luna scared the crud out of me---she actually had a hypoglycemic episode. I was free-feeding kibble, and she just would not eat enough. So I started last week giving the girls a spoonful of canned food (DVP Natural Balance LID) in the morning and evening. They have kibble down to crunch on whenever they want. So far, though they have gained a few ounces, they are doing great on this system. I fed them way too much, at first, forgetting how tiny their stomachs are

So I cut it way back and their fat bellies are less so now. I was mixing their kibble in (measured) with the soft, but they mostly left that all over the kitchen floor and didn't eat much of it that way. I dunno, I may pull up the kibble and try again, but in the meantime they are combo kids