Ok, basically you're not going to notice the extra gain on the VH. I'm speaking from my own experience of the amp so other impressions may differ but to my ears the VH doesn't cover much ground the GH isn't capable of except for maybe reverb and the obvious switching options.
Again, if you need the convenience of multiple channels then the VH is probably best (though I wouldn't buy one again). If, on the other hand, you're after a simple, reliable amp with a great tone I'd go for the GH100.
Its a tough one as I'm more into single channel amps so this may not be too helpful. The GH amps gave me what the VH did without the problematic footswitch, the noise (more apparent in the VH) and the weight.
If you know the GH sound then you know the VH sound. Its just a case of choosing between simplicity or apparent flexability :)