The applications with the hardware. So for each major platform of iOS, Android and Windows you have to find the apps you love.
So for hardware I'd look at the new Apple Pro tablet and Pencil.
Then the Microsoft Surface and it's pen. https://www.cnet.com/products/surface-pro-with-lte-advanced/review/
I don't see any current high end Android tablets today as Google seems to be letting their Nexus lapse.
Im looking for the best tablet/computer/laptop option. Want to take a picture with the device, than draw on it and save to the cloud. Would also like to have a PDF that I can draw on as well and than save as well, different versions. Open to andriod or ios. Price isnt the first concern.