From what I understand, males tend to be larger and heavier then females on average. I have an 02 male Butter and an 02 female amel okeetee, and my male is longer with about the same girth. In Kathy Love's Cornsnake manual on page 33, she states that males grow longer and heavier then females. I was at the Carolina Reptile Show and saw some of Kathy's adult male breeders, and I have to say, these boys were huge.
As far as different morphs and personalities, I don't think you can generalize a morph to a behavior, although Rich Z has a good article on Amber Cornsnakes on his website, saying they seem to be more fearless then other morphs. Fearless meaning more relaxed, not timid or afraid to be handled. I only have two adult corns to make an observation on size, and my male wins hands down on size. Maybe Draybar, Hoppy, or some of the others with more adult corns can give a better judge on size with male vs female then I can. Good luck.
Steve