Hello,
That is a hard question, really as they are all so different. Sometimes, the males are more aggressive, especially during breeding season. Then tend to calm back down once their hormone levels start to drop over the summer months.
Females however, have been known to be quite aggressive as well, but not usually as much as the males. It has been said that males have more of a personality than the females, but others have said that females are more sweet.
I think, personally, that it is the luck of the draw & depends greatly on how much personal time you are willing to spend with each one of your dragons as to how their personalities will develop.
I hope that helps a little bit.
Tracie