I agree that for Solidworks, the graphics processor is very important.
Rendering is often CPU based so you have to look at the CPU benchmark rating.
An SSD is highly recommended and make sure to have an external backup drive as well.
You don’t need extremely high specs to run Rhino so you can go for a modest budget laptop with lower RAM, CPU and small SSD, as well and invest in a desktop PC as your rendering powerstation and backup drive.