Which kind of cake would you expect to have better keeping qualities a sponge which is low in fat or high-ratio high both and sugar?

A high-ratio cake which is high in fat and sugar would be expected to have better keeping qualities than a sponge cake which is low in fat.

The high fat and sugar content in a high-ratio cake acts as a preservative, helping to prevent the cake from drying out and becoming stale. The fat also helps to keep the cake moist, while the sugar provides sweetness and helps to prevent spoilage.

A sponge cake, on the other hand, is typically low in fat and sugar, which makes it more susceptible to drying out and becoming stale. Additionally, the lack of fat in a sponge cake can cause the cake to become crumbly and difficult to handle.

Therefore, if you are looking for a cake that will keep well, a high-ratio cake would be a better choice than a sponge cake.