We want a sustainable flock, so we need a hen or two that will keep us in regular chicks, but not be bullied by our current flock members.
Some chickens I've had go broody:
Red Shouldered White Yokohama from McMurray Hatchery
Dark Cornish (Standard size) from McMurray Hatchery
White Laced Red Cornish (Standard size) from Ideal Poultry
Old English Game Bantams from Ideal Poultry, several colors
Cornish Bantams from Ideal Poultry, several colors
I was dealing with small numbers, so I have no idea what is "normal" for each breed. But for each of those breeds, at least half of them went broody (the only one I had, or at least one when I had two, or at least two when I had three.)
For the bantams, I had some in with standard sized chickens, and they were fine. My guess is that the other ones would also have been fine with standard-size chickens.
The Old English Game Bantams went broody the most frequently (lay a dozen eggs, go broody, raise chicks, repeat.) Of course the bigger birds could cover more eggs per batch, so they might raise just as many chicks per year and also provide more eggs for eating.