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Is 0% credit card utilization worse than 1-20% credit card utilization for any reason other than pure statistics?
One rule of thumb is that having regular activity on at least three different revolving accounts will improve your score: I agree that it may not be a great idea to have too many open credit accounts (Trade Lines) reporting on your credit report but if you don’t have enough active accounts, it will  prevent you from being approved for a home mortgage. Both Conventional (Fannie Mae and Freddie Mac) mortgage loans and Government loans (such as FHA and VA) require that you have a minimum number of reporting trade lines that are active or have been active within the most recent 24 month period of time. An example of meeting the mortgage loan requirement is having a revolving account (credit card) that has been reporting activity for the past 24 months plus 2 other trade lines that have had activity reported for 12 months each, both within the past 24 months.