Ok I'm pretty sure the question wasnt whether A-Rod sucked or not...
As for the Red Sox fan, thank you for proving my point that most of you are complete idiots (most because I know some Red Sox fans, like my French teacher, who actually know the game of baseball and dont go around shouting 'THE RED SOX ARE BETTER THAN EVERYONE!' when they're 15 games out of first place...)
But anyway back the topic at hand...
I play both. You need to have a good arm for both positions. If you dont have that look at 2nd base. If you have the arm, its all about your athletic abilities. Both positions need pretty good reaction time, third base more-so than SS. If you have good range and good hand-eye coordination, play SS. If you dont have the range but can just plain knock balls down, play 3B. All-in-all its wherever you feel comfortable.
I've had high school coaches tellin me I should be a LF for 4 years. I'm graduating HS after this year with Division I colleges looking at me to play SS for them. So no matter what happens, good luck and stick with it.