Yes, I've thrown both, and I would say at box surface the VE would be a touch stronger overall. As well, the VE is a hybrid so there are more options available in terms of surface prep than the Gravity Shift.
Despite this, when I give the Gravity Shift some surface without some polish the ball is strong and very arcy. Typically the first ball out of my bag if the lanes are a bit to dry for my Hy-Road.
It's probably a case of personal preference, but I ended up giving my VE away.