Which laptop should I buy? For AutoCAD, Creo, Solidworks and SketchUp
Firstly it will need to be a Windows laptop. You can’t consider MacOS for your requirements. Solidworks is only supported on Windows.
Secondly, you say you need to run the software ‘side by side’. You’re never going to need to run these apps concurrently. That would be terrible. You will run one app, quit it and then run another.
As a starting point, you can see our guide at Scan2CAD for the best laptops for CAD.
Your best bet would be a PC work laptop that can handle upgrades and modifications when needed. With the way hardware is set up, you’ll be getting newer and better models almost every year, so a laptop that can be upgraded guarantees a longer lifespan for your machine.