Hmm.<br/><br/>Personally?  My take on Saiyans is that "They have lots of raw power to throw around, but not a lot in the way of special techniques".  So they'd have higher base stats, but fewer options in a fight, because they have problems with more cerebral techniques.  On the other hand, once you reach a certain point, being crafty and cunning just stops mattering, because the only thing that really matters at the top end is how hard you can hit another person.<br/><br/>Humans are excellent "Technicans" in that they can come up with exotic powers that can let them punch out of their weight class, but they have problems in a straight fight against superior opponents, especially if their trump cards fail.  They can be excellent as backup, but if a Big Bad focuses on a human character, the human character tends to go down fast.<br/><br/>Androids I figure have the advantage of that they're<em>Astonishingly</em>hard to kill, and they don't use up power.  On the other hand, their growth is more-or-less static.  They can't gain any real benefit from training, and they can't come up with last minute powerups to turn defeat into victory.<br/><br/>Half-Saiyans are kind of between humans and full-bloods I think.  They have greater power then a human, and they have better control and adaptability then a Saiyan, but they have problems with focus as a result of this, and their abilities tend to fluctuate far more then either of their parent species.<br/><br/>Of course, that's just looking at the setting from an omniscient point of view.  I have no idea how to translate that into mechanics.