Newest ipad pro + pen is butter smooth, but pricy.
Google's latest chromebook pixelbook has a nice pen option and it has hand writing recognition so I think it's easy to convert to regular text. That's also a pricy option, but it's a sweet 2-in-1 laptop and Chrome OS is good for a lot of productivity tasks, note taking, emailing, scheduling etc. I want to pull the trigger on one, but I have too much other stuff to get right now to justify the purchase.
Surface products from Microsoft also have a nice pen.