The answer is:
You want to use your credit cards.
You do NOT want to carry a balance.
Want to know an easy way to do this?
Use your credit card for your normal expenses- utilities, gas, groceries (but be careful not to use it as an excuse to go overbudget), etc.
Then pay it off, in full, every pay day.
Bonus points if you use a rewards credit card. It is like getting free money (but only if you do not pay fees or interest).