Depends, where are you located? On very cold windy days, mine will not leave the coop for several days, having space for them to spread out, keeps squabbling down.
Same with the run. Chickens will have a pecking order. Giving the lesser birds space to escape with things to hide under, or...
Rule of thumb is 4sq ft of uninstructed floor space in the coop per bird, and 10sq ft in the run. So 20 in the coop, but only 6 in the run. Your general location would help us help you. Will you be free ranging at all? Are you planning on large breeds only?