I have had a fair number of single cmb whites, rose comb whites, and rose comb dark brown.
I have had a few single comb light brown, black, and exchequer.
I found that with chicks I do have to watch available space.
If you pack them in too tight... they will eat each other. :hide
The white Leghorns do mellow down very nicely once they age.
In general:
I found the rose comb whites not quite as cannibalistic as the single comb whites.
The...
I raise Leghorns, and the white Leghorns scare me every year! :lau
Their combs grow so much faster than everyone elses! (even much faster than the combs of the brown leghorns)
The white Leghorns also get pink on their face VERY EARLY, so that often I am sure they are male! To make it even...