Need some advice on food please.

I have always fed my older cat either Whiskers or Felix tins or pouches and usually Iams dried food. Now I have my kitten I have been trying to give her the kitten versions but that's not easy as she likes to 'share' the older cats food.

On a visit to the vet last week he told us that we should be feeding both cats on just dried food. He said that all cats fed on dried food are far healthier than those fed on wet and dried.

I am now confused. Any thoughts? My older cat is a moggy and the kitten is a Siamese cross. Thanks.