If your full-time at both and love it then their both great paths to take.
If your casual or worse contracted then both can be nightmares.
Both can teach you alot.
Better yet save your money and go charter... Then when you got your hours up and feel like you could give something back with your experienced gained do instructing.
Done both and can't fault either experiences except in my opinion (Just mine leave me be) Instructing taught me the rules and charter taught me to get home alive.