It really depends on the role you're filling in the band.
I'm primarily a bass player; I use my VI through my bass amp all the time to play
bass parts (though I do more chording than most).
I also play
some leads on the VI, in those instances, I tend to play through my Twin Reverb with a good dose of reverb.
I also bi-amp to get a full, dynamic sound, playing through both amps... though I don't do that on stage very often, as it requires bringing a second bass amp for when our lead guitar player plays bass while I'm doing leads on VI or playing second guitar. Bi-amping is kind of ideal with these things, if your back can handle it
Robert Smith plays his through a Roland Jazz Chorus, while Peter Hook generally takes the bass amp or bi-amp route with a HiWatt Custom/Marshall bass amp, an Alembic pre- or Ampegs, through bass cabinets. In the end, it's your EQ that's going to determine just what you sound like, and you can get great VI sounds out of either or both bass and/or guitar amps.