Magcro:
+ major vulnerability group buff (more desired in prog groups cause of it)
+ More aoe damage
- clunky skills (blast ones+Tether)
Sorc:
+ More fun, because frags are fun.
+ minor prophecy to group
+ Slightly better single target damage if your group already have enough necros
- pets
- No bar space
- no AoE damage
- hunting curse/daedric prey is bugged in PTS
From my experience, I might be wrong