The only advantage I can personally think of is looks.  Some claim the hybrids hit harder because you arent limited by the current capability of the 510 connector.  Lower voltage drop. I personally think you can get PLENTY of fire from a 510 connection.  If something were to go wrong with your hybrid, chances are you could get it fixed.  Most hybrids are limited production high end devices.  I would imagine most companies that make them would fix them.  Probably for a fee.