Both.

Depends whose best in the... Woops... :p

I meant to say if you have to ask that question what the hell are you doing being married?

Depends on which one you want a divorce from.

If you are even considering picking a friend over your wife, then you have serious marital problems.

Maybe you need to see a counselor.

Why do you need to pick?

If your friend is indeed your friend,they would not make you choose between your spouse and them,and your wife should understand you need friends as does she.

More information is needed here.

Why do you feel the need to choose?

If your friend is a bad influence on you perhaps your wife is pulling rank?

As I said,more information is needed.

You don't have to chose, nor should you, as long as you have healthy boundaries of good behavior in your marriage. For example you don't put your friends needs over your wife's needs.