Good choice OP! The debt snowball does work (personal experience)!!! As a pp stated, it's a mental game not a mathematical one. And freeing up $45 instead of just $20, gets everything paid off faster. Keep adding to the snowball as you pay things off. Eliminating 4 debts instead of just 2 is a great motivator, and will make you work harder to find ways to knock out the rest of the debt even quicker so that you can progress.
Smallest to largest wins the race. We can all add, but when you're not motivated to do it, it doesn't get done. People need small victories to keep them excited and motivated. Do you think someone struggling with debt would rather say, "Phew, I have 4 fewer bills to worry about." or, "I saved $8 in interest this month." Most people just don't "care" about interest when they have an overwhelming mountain of bills staring at them, interest is not really tangible and isn't really noticiably impacting their day to day. Why else would someone use a card with a 10%, 20%, 30% interest rate? Why do most stores offer 0% for 6-12 months? Because banks know people just don't "care", and they make BIG BUCKS with the knowledge. (
When people start seeing some progress though (i.e. fewer bills), they like that feeling, and are motivated to do anything possible to keep that feeling alive, in other words, pay off the rest faster!
BTW - notice "care" in parentheses, for emphasis, not literally.