really depends on how much money you're looking to spend and what your priorities are.
vr6 pros: faster stock, more reliable setup when compared to modded g60. 1993 1/2 on have a nice interior, mk3 like interior. Vr6 has nicer bumpers and nicer hood.
g60 pros: lighter, better weight distribution, better handeling, g60 can be modded for very cheap, cheaper to buy. Supercharger sounds amazing with a p-flow. Has cool brake cooling ducts.
vr6 cons: expesive to buy and modify, heavy, car tends to nosedive a bit like all vr6 mk2's.
g60 cons: supercharger maintenance, ugly turn lights, ugly hood, bumpers are too pointy, the interior is sorta ugly(some vr6 have this interior also, early 1993 models). g60 tranny sucks once you modify and have like 200hp, 1st becomes worthless.
If you prefer a lighter feeling car, I'd go with the g60, it's more of a rice-rocket than the vr6. Personally, I like both equally allthough i've only had a g60. The g60 will smoke a vr6 when you slap on about 1k of mods, i.e. stage 4 from bbm.