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Wet vs dry: what the evidence says
The water argument is the strongest one
Canned food is mostly water and dry kibble is not: Cornell's feeding guidance describes canned food as at least 75% water and a good dietary source of water, and FDA guidance puts typical moisture around 75-78% for canned food and 10-12% for dry. For cats with urinary tract disease, vets often use extra dietary water to help keep urine dilute; whether wet food belongs in your cat's plan is a question for your vet. If your cat eats dry only, fresh water should always be available, and some cats drink more readily from a fountain or from several water stations.
Weight and energy density
Because the water is removed, dry food is more calorie-dense per gram than wet food. Portion control matters with either format, and measured meals make it easier. For an overweight cat, ask your vet about the right food and portions - including whether shifting some or all of the diet to wet food makes sense for your cat.
Common claims that don't hold up
A practical way to choose
Pick the format combination that fits your cat's health picture, your budget, and what your cat reliably eats: any complete and balanced food beats the "perfect" food your cat refuses. If your cat has a urinary or kidney history, diet choices are individual - ask your vet whether wet food belongs in the rotation. Whatever you choose, check the AAFCO statement first, and switch gradually, mixing the new food in over several days and slowing down if your cat's stomach objects. For label-by-label comparisons of specific products, use the comparison guide.