How to generate 3D CAD model from ContextCapture

Hi friends,

I am a new intern at Bentley Systems, I am working on a 3D reality model using ContextCapture software, now I want to generate a 3D CAD model of the object for later analysis. 

1. I know ContextCapture can generate 3D Mesh file format such as 3MX, S3C, STL, and Point Cloud file format such as LAS and POD. What file format should I choose in order to convert to 3D CAD model?

2. What software should I choose to generate the 3D CAD model using output file from ContextCapture? MicroStation, Pointools or any other Bentley software?

Thank you in advance! Any suggestion or idea are appreciated!

Colin