What is the best units to put in a Defense Bunker?

A lot of people like to put Falcons but a bunch of Colossus can destroy Falcons.

Currently I have 13 Colossus and 1 Bazooka in all my 4 DB.

I do not know if 10 Colossus and 2 Zeppelins are better than 13 Colossus and 1 Bazooka.

What do you think is better?

10 Colossus and 1 Zeppelin OR 13 Colossus and 1 Bazooka

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