Who would you rather be the Defense attorney or the Prosecution attorney? Why?

Defense. I'd never live with myself if I forced an innocent guy to go to prison

what about keeping a guilty person out of prison?

Choose a side Sayf. In the real world you can't switch.

Also flame you don't care about possibly murderers, like Mubarak's lawyer?

If you're a defense lawyer you can always choose who to defend, and if you're mandated by the state to represent someone you don't have to try your hardest.

Either way, if you're smart enough, you can pick your battles wisely, even with murderers.

How will you know if someone is innocent or not? Lawyers are known to free murderers.

Sometimes they'll just admit to their lawyers, like in the Tim McVeigh case.

I'd definitely go with defense, for the same reasons Flame posted, and because defense lawyers have a greater potential to make the prosecutor look stupid than the other way around.