I have an eight-year-old laptop that needs replacing and I’m paralyzed. What are the most reliable ones now? Do I need a desktop for CAD? Pros and cons of operating systems (and where do I find them?) Browsers ditto? Where do I find answers that aren’t just product marketing?
Not for the raw processing power, but anyone doing serious CAD work is going to want at least a 21" monitor, relying on just the laptop screen is going to be difficult especially (and I speak as someone aged over 50 myself) as your eyes become less able to focus on fine details as you get older.
So OP needs to decide if they’re going to want to use the machine for other things as well, in which case a laptop + external monitor might be fine, or if it’s a dedicated work/hobby CAD machine in which case why not get the desktop + monitor.