I would recommend a female of whatever morph or het morph you like. A female because they take much longer to reach sexual maturity and whatever catches your eye because snakes take work and attention and money.
My very first snakes that I ever ordered from a breeder were a pastel het ghost and a het ghost. I quickly moved forward with 1.1 mojaves. I then quickly moved forward with a spider, ghost, pastel, lemon pastel, lesser, 0.2 normals, albino, and axanthic. Out of all of those, only 4 are males.
So get what catches your eye and have fun with it~ the fun comes first