The choice is really very easy, just follow the following questions:
- is your character gonna be named Hulk or Hulck? ---> choose a male Orc
- so you want a butt-ugly, yet female, green character? ---> choose a female Orc
- ifff ya want a raggatalkin' muffin' breakdancin' mattafakka ---> choose a male Troll
- want to be a female Bony M, but blue, even skinnier and with tusks? ---> choose a female Troll
I will even help you further:
- want to be a bull on steroids and an itchy butt? ---> male Tauren
- milkcow? ---> female Tauren
There. A decision-scheme.
(my shaman is called Hulck by the way, made him green with the appropriate black hair and found him a nice short pants and never dress with anything else except for rings, head/cloak (hidden) and trinkets)