I'm at a crossroads with trying to decide which would be best also,,small pens able to hold at most 8 hens and 2 roos,or building one large chickenhouse,with a walkway down the middle and the attaching runs on each side.I have considered fencing off individual pens,maybe 15' x10' wide,with one spot where I can move a "tractor" and rotate birds from pen to pen,as they eat the grass down,but also strong winds and severe weather gives me concerns about this idea.
I am planning on a large number of chickens the next few years,and want to plan correctly now,but since I will be keeping bloodlines seperate,large pens and runs are not needed,thus more expense in fence and work.