Leghorns are a small, energetic bird. I have RIR in the flock and find them friendly, steady, but mouthy. I have never kept an RIR roo, so cannot speak to that. But experience teaches that generalizations are important, but differences in individual birds will always occur.
My white leghorns are very sweet and they lay a lot of eggs, almost every day! I adore them. They are pretty too. I hand raised them and give them a lot of treats. They were part of my first chick purchase (ever) so I guess I'm a bit biased. Still I had no intention of having pet chickens (just some eggs!) but those leghorns and golden comets (who also lay a lot) stole my heart, and now I have a new hobby
I've heard the leghorn roosters aren't very nice though. My neighbor has a leghorn rooster and he is not that friendly, also very dominant. I don't believe he had a lot of human interaction, so maybe that made it worse.
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All of my animals get a lot really well! One cat did swat at a chicken today while the bird was trying to take her food,
but most of the time if I put food out, they all come running - dogs, cats, and chickens.
and eat happily together. Most of the time they don't pay much attention to each other. My neighbor however did adopt a stray male cat recently, and he is becoming a bit of a concern.