Easier to just say most. When I'm feeling lucky I do a google search for "Who pulls credit" WITHOUT the quotes. Gives me a really good idea of which CRAs get pulled.
I don't think any CCC pulls from only one CRA every time. But some are known to pull from one CRA a lot more than others. A lot depends on where you live too. Amex is a big EX puller but just remember there are no is guarantee. Take a look below in my sig line and click on CCs BY FICO SCORE AND LOCATION.