Akitas are territorial, particularly males. Their form of protection is slightly different than a GSD's form of protection. the average akita is not skittish like the average GSD is. (Curse the Backyard Breeders. The GSD is one of the more troubled breeds now)
The average GSD will turn to aggression out of fear. The average Akita (And well-bred Shepherd) will turn to aggression when they feel their territory or family is being threatened. If the Akita is well-bred, well-trained and well-socialized, they are WONDERFUL protectors, but calm and accepting of friendly strangers, and generally a very good companion for someone who fully understands dog behavior, particularly dominance.
I don't recommend an unneutered male akita for anyone who hasn't had LOADS of experience with stubborn, territorial, and generally 'difficult' dogs.
I'm certainly not saying that Akitas are always stubborn, territorial and difficult, but that's what you should be prepared for. Who knows, you might be pleasantly surprised, or you might get what you were prepared for.
EDIT: I also am not saying that GSDs are all fearful. There are many wonderful, stable shepherds out there, but I was referring to the average BYB fear-biter shepherd who are giving the breed a bad rap.