Buff Orps are some of your heavier birds, usually a bit larger than the Barred Rocks. Why is that you want only smaller birds, if I may ask? My BR girl, Lexie, only weighs about five pounds(she's extra small for a standard) and my other BRs only about six or slightly more.
My vote is always with the Barred Rocks. I do have wonderful RIRs, but their personality varies more than the BRs. All of my Barred Rocks are always friendly, curious, funny, and excellent layers. The eggs get to be extra large to jumbo as they get older, too. I adore my Barred Rock girls. I...