Depends on how you throw, what you already have you like, and what kind of reaction you are looking for.  Both are good balls when matched with the right person and the right condition.

VG is early and strong with a bit more backend angle then most solids.  VE is IMO just a stronger version of the original Gravity Shift.

For me I use the VG for longer sport shots like Shark and a Fresh Scorpion pattern.  Since I have medium to slow speed with decent revs the VG is too strong for most house patterns.  The VE is very strong too, but the 1/2 pearl gives it enough length and return that it is useful on almost any medium to heavy shot where you want to swing it and bring it.