Sorry charlie, er… Tony. Genetics do not work that way. The sweet 100 is highly likely to reproduce cherry tomatoes next year but they are not likely to be anywhere near as vigorous, productive, or sweet as the hybrid. As for the Big Beef, it also is a hybrid with very similar issues. If by chance you manage to grow a plant that is a bee made cross of Big Beef X Sweet 100, it will be a small cherry tomato similar to sweet 100. Why? That is how tomato genetics work.
I gave a description above of an F1 hybrid I am growing from a large meaty heart shaped tomato (Tastiheart) crossed with a small cherry size tomato (LA0417). The result is a tomato that is about 3/4 inch diameter. This is typical of tomato genetics. There are 12 identified mutations - and probably many more that are not yet identified - in large fruited tomatoes that make them produce that huge fruit we enjoy so much.