Neither Reagan nor Clinton deserve credit for their boom, the devil is in the details Reagan benefited from several factors including increasing number of women entering the workforce and the fed taming inflation. Clinton also benefited from technology and manufacturing innovations boom at the time he was president, things like NAFTA take years to take effect. If you want to be frank Clinton takes a bulk of the blame for the 2008 financial crisis because he removed depression era regulations that would have prevented it and the housing bubble.
Unfortunately presidents get too much credit for things that sometimes just happen when they are in office.