Birth control is an issue of concern for both males and females however males get less of an option. Men have five methods of birth control:

1. Abstinence
2. Condoms
3. Outercourse
4. Vasectomy
5. Withdrawal

This brings me back to the question of what is the 'best' birth control for men, in terms of avoiding pregnancy there are 2 obvious ways with 0% risk in the methods listed above: Abstinence and Vasectomy.
However, if Abstinence or a Vasectomy isn't an option the most efficient way of preventing pregnancy would be combining birth control methods, e.g.: using a condom and withdrawing whilst your partner is on the birth control pill or using a female condom.