Jersey Giants and Brahmas grow huge, but they're very slow growers and the cockerels grow a bony frame long before they put on meat.
IIRC, JG's were favored for capons and grown out for many months without getting tough or strong-flavored the way they would under the influence of male hormones...
Welcome to BYC!
If you put your general location into your profile we can give better-targeted advice. Climate matters. :)
As a general rule, there is no chicken that excels for both meat and eggs.
NOTHING outclasses a commercial strain Leghorn for maximum eggs on minimum feed -- though that...