Hybrids are one-stop individuals rather than actual breeds. The hybrid layers should produce a lot of eggs, but might not be so productive after that first year or two, and they are smaller, so not so good if you plan to eat them.
Cornishx meat birds are meant to be in the freezer by eight weeks of age, and rarely can live comfortably for much longer.
If you are interested in the most economical egg producers, the commercial method of 'all in, all out' every year is the way to go. Nobody is a pet, and nobody lives longer.
If you are interested in having eggs, interesting chickens, and maybe offspring later, purebreds and especially heritage breeds are the way to go.
Mary