I think the difference lies in the assertation of truth that lies behind the statements.
In order to embark on philosophy you have to first concede that literally anything could be true. Of course, in its most basic form, philosophy is a search for truth but at the same time that truth could be anything. Even something you or I vehemently believe as untrue.
The facts you are presented by any philosopher should be supported by some sort of proof that goes beyond the assertion that "this is true".