I am basically a zerg player so when Im paired with a terran in a 1v1 match, i usually do the zergling bust.
This is the build order.
If I scout the opponent and see that he isnt doing something crazy like a proxy barracks, I do:
17 zergling ==> and continue to pump them
Then upgrade zergling speed with the first 100 gas you get, and then with the next 50 gas, a baneling nest, get 6-8 banelings.
When your supply is at around 30-35, go attk with banelings destroying the supply depot, you need about 4 or 5 to kill the supply depot, then the rest for killing some marines. Continue Queing zerglings to the opponents base.
Hope this helped.