I'm used to being able to quickly draw diagrams etc. on a whiteboard at work during discussions with colleagues, and now that I'm working from home I want to find a device to use as a virtual whiteboard while on calls.

Does anyone have experience/recommendations for a device with a good pen that's comfortable to use and is easy to draw diagrams, flow charts etc?  Which (Windows) software do you use?  I've been wondering about a Surface Pro/Book or perhaps a Wacom Cintiq.  Are the non-display Wacom tablets intuitive to learn how to use for this non-artistic type of work (looking at the monitor while drawing with the pen on a tablet)?

Does anyone have a device for sale?