A good blend of properly used unsecured credit lines helps to increase your credit profile by showing the credit bureaus a nice mix of credit. Credit mix counts for 10% of your credit calculation, and credit cards are a fine way to help meet that criteria.
In rebuilding your credit the use of secured credit cards and merchandise cards can go a long way. These cards are not the end all for consumers, merely a spring board to better credit, which eventually lets you qualify for the “good stuff”.
We can never have too many tools in our belt when running a business.