80% - I disagree with the credit card one though. It's not as cut and dried as "annual interest rate vs annual fees".
If you are always paying your balance in full the annual fees are frequently more costly than the annual interest rate. You will pay some interest but it's going to be a fraction of what you'd pay if you were carrying a balance.
This is especially true when you are turning over volume on your CC and instead of paying the bill every month you are paying it every week as I've seen a few people here mention. I do this myself.
The interest you'll pay is potentially low; the fees are a fixed cost. They are both important. And if you have a premium/higher end credit card you will be paying annual fees.
So in short - I can see it going both ways.
you are correct. But for most people the credit card annual fee they pay is probably low ( $100-$300 )? this is way less than what they would pay even with a low balance on the card on interest...