Is someone who plays in a chamber orchestra more skilled than person philharmonic orchestra?

Not necessarily. Musicians who play in chamber orchestras and philharmonic orchestras have different skill sets. Chamber orchestras typically have fewer musicians than philharmonic orchestras, so each musician has more responsibility and must be able to play a wider variety of music. Philharmonic orchestras, on the other hand, have more musicians, so each musician can specialize in a particular instrument or genre of music. Both chamber orchestras and philharmonic orchestras require a high level of skill, and it is not always possible to say definitively which type of musician is more skilled.