I don't think it makes a difference across the board, other than that females tend to be smaller and thus might be better if you want to do things where a smaller size is advantageous. Also, males tend to be more prone to urine marking, which can be annoying (and in Crookytail's case has gotten us a couple of NQs for urinating in the ring).
There are individual lines and litters where the males seem to have a tendency toward certain personality traits and the females seem to have other personality traits, but I don't know anything about the specific litter/lines that you're considering. It might be something to ask the breeder.
Beyond that, I personally don't put a lot of stock in gender stereotypes.
ARCHEX TDCH Pongu the Insane, CD-C, RN, RL1X4, RL2X3, RL3X (GSD mix, b. Apr 2010)
Crookytail the Tigerwuff, RL1, NTD (Akita mix, b. Jan 2011)