The bantam roos aren't as friendly in my experience.. but maybe that's just me? I've had banty frizzled and game hens, and banty cochins, and even polish and none of them were very friendly.. I have a barred rock mix rooster who's extremely friendly and HUGE, he's bigger than my jersey giant hen and he's so sweet to all my chickens, he's roughly 7 months and he's hanging out with my smaller younger welsummer chickens who just turned 4 months. He's even nice to my other roo. Hell, he goes to my neighbor's house and hangs out with their two hens, it's cute. If you're going to get a medium sized friendly roo, I'd recomened a barred rock mix with a bantam..
Nankin Bantam Rooster hand raised will warm right up to you, they love being around people! I am raising Nankin Bantams decide not to go with stanards, with a flock of Bantams we will have plenty of small eggs for two people, and plan on breeding and saeling hatching eggs and chicks. Just starting so next year for sales.