I like more debit cards, but I'm playing with 7 credit cards having a lower than the 10% of the credit limit.

Credit cards are weapons to grow your financial life. I want to buy a house in 2-3 years... so I'm using the credit cards with the lowest amount possible. By that way, I have low debt and I'm demonstrating I do not overextend my self with credit, but at the same time, I give some profit to the lenders...

By that way, in two-three years I will have very high credit to get a low APR loan.

For me a credit card is just to grow the credit for the real moments.