Why does cat like the jelly food over the gravy food?

The jelly food has collagen in it would be my guess. She craves collagen.

My last cat was even picky about what brand the food was.

Lol hey. We all have our own specific tastes, even cats.

If youve ever had soup made from real stock, i reckon that's the reason.
Its tastier.
Food with real collagen and fat is yummier.

Maybe it’s more natural meat juices and the gravy is more flour and grains.. who knows

Better flavor