Glossy and satin? Depends. Either can be done in varying degrees of quality. A lot of people complain about gloss finishes being too thick and satin therefore having better tone but this isn't always the case. Satin finishes can still be quite thick while still remaining dull and gloss finishes (especially nitro) can be quite thin.

As a general rule, gloss tends to protect the wood underneath a little better but not always. For recording and performing with a pickup system using a mic a gloss finish is quite when rubbed with clothing and skin but a satin finish has quite a bit of handling noise.
Winner of the 2011 Virginia Guitar Festival

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