Create environments in CAD or in Unity?

Howdy,

I have an HCT Vive and am using Unity to create immersive 3D experiences.

I'm a new Unity User but an experienced CAD (Solidworks) user.

I need to create a VR environment of a small retail space like a convenience store or a Starbucks.

What are the pros and cons of creating this in a CAD program like Solidworks versus creating it natively in Unity versus buying it from TurboSquid / etc?

I'm pretty quick with Solidworks but don't know if performance will suffer due to...

Create environments in CAD or in Unity?