Kay;
I do not have an oegb cockerel or roo so I can't respond to that.
Nor do I have any experience with barred rock bantams.
Had a Sebright cockerel with a bad attitude. He "learned" to respect me but my youngest and my wife and that bird, did not get on well at times.
Currently, we have a Serama cockerel, a very fertile, tiny little guy, that gets along with everybody. No power play with him. He is not keen on being picked up but, when I do, I give him a little squeeze and he likes the warmth! He makes a little giggling sound that is funny to hear. I rub him up against my face. My sebright pullet is bigger than he is! Of course he thinks he's Don Juan!