Every software has bugs. But if VB4 is more actively developed, you have a better chance a bug will be discovered and fixed in VB4 faster.
The only advantage of VB3 is having bunch of add-ons specifically made for this version, so some old forums have VB4 because of this reason only.
A highly-customized forum is a big deal if you decide to move to VB4. I would not move it to VB4 any time soon.
When you start from scratch, you better start it with the latest.
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