They fit in well with the rest of the flock, and the 3 females have assumed higher rank than other hens of the same age, but they don't challenge older hens and they aren't mean to youngsters, so their assertiveness is modest. Two of the males didn't survive to maturity and the third succumbed...
Of the three breeds in contention, I can speak for Swedish Flowers. Had them since 2017 and they form the core of my flock of 20+. I recommend them without reservation. Great temperaments in males and females (no bullies), great foragers and free-rangers (predator aware), disease-resistant...