I have all of the above..
I prefer NI original B4..followed by NI B42.
VB3 is good, but not up to NI B4..
The G70. Has one of the best B3 hardware organs, but you need a volume pedal to tame the upper range, just like a Hammond B3.
Actually i wouldn't know how to be expressive on an organ witouth volume/expression pedal...
And yes, Roland has allways had great B3 organ sounds, definately the best in hardware