The Dorking is a pretty great all rounder
Dual purpose
Relatively quick growth
Broody
Great foragers
Fit for all climates
White skin (good for meat)
https://www.roysfarm.com/dorking-chicken/
I feel this will become a featured thread.
So you're looking at a breed that has the characteristics of a Cochin (broody, meaty), Brahma (cold hardy, broody, meaty), Leghorn (heat hardy, eggs), Icelandic (foraging), and Chantecler (cold hardy)