I have tried VertexBD shortly for a few years ago before I invested ArchiCad. And what i now, you can't compare V.BD and ArchiCad. ArchiCad is primarly a design software and VertexBD are (or was) primarly a production software with a designpart.
What are you working with? There you have your answer of what software you should look for.
Are you a buildingcompany where you build walls, slabs and so on in a factory and set things together at site, then VertexBD (or similary software) is your choice.
Are you an architecture or design company, then VertexBD is too complex and expensive and ArchiCad (or similary software) will be your choice.