Siamese - Science Diet vs Royal Canin Siamese 38?

My two siamese kittens absolutely LOVE the Royal Canin. I'm sure they're both very good, but my kittens prefer Royan Canin (not that your cat is guaranteed to like it as well, but from experience I'm suggesting Royal Canin), but if you feel safer with what the professional vet tells you, then go ahead and get the Science Diet. You could get them both, and see which one your cat likes best. We did this with several cat foods, so our cats have a variety of food, and we know which they like best by the amount of times we have to refill them. Hope this helped. =^_^=