Depends on the games you want to play. If there are more than two buttons, I'd say a right-handed person will definitely want the stick on the left. I personally have more finger control with my right hand, and moving the joystick takes slightly less precise control, especially in fighting games.
If you plan on sticking with games that only use two buttons or less, I don't see an issue, but try moving a joystick with your right hand and pushing 6 different buttons with your left, it's pretty difficult.
Just my .01 cent (probably not worth the extra penny).