Paying off a card?

I have four credit cards that are consolidated. One of them only has a balance of $168.00 left on it. I'm planning on making a $100.00 payment on that card. But I was wondering if it would be better to put that $100.00 onto a card with a higher balance. I just wanted to put it on the smaller one so I could get it paid off within the next three months. Which one is better?