What's convincing you to choose Samsung Note Pro instead of an iPad?
Personally, I'm looking at Microsoft Surface Pro 2 instead of any tablet, because it's not just a tablet, but an x86 PC that can run Ubuntu (yes, 2, not 3, because larger size and loss of Wacom digitizer while retaining the same hardware don't look like improvements to me). I even think Apple will present an "iPad Pro" along these lines, this year, with a killer feature of being able to run OS X apps. I don't live in Apple-land and I don't want that, but it should be popular.
The 12" screen and the better digitizing pen. My application is much more notes/sketch focused. I've got several different stylii for the iPad, none of them is as nice as the Note's pen. I like the larger size so that I can see more of the sketch even while zoomed, I don't care about having it in my pocket. The contenders were something like a Yoga 2 pro, the Note pro, or something from Apple. They don't have anything in that space so for that reason, they're out.
What kind of digitizer is there in Samsung Note Pro?
If you are so flexible as to consider Android, iOS and Windows, you should consider Microsoft Surface Pro 3, too. I am really interested to know your opinion; my email is in the profile if you will actually look into it and decide to share. For me, Microsoft tablets are an overseas shipping order away, so I hesitate a lot before buying a completely new piece of hardware.
Personally, I'm looking at Microsoft Surface Pro 2 instead of any tablet, because it's not just a tablet, but an x86 PC that can run Ubuntu (yes, 2, not 3, because larger size and loss of Wacom digitizer while retaining the same hardware don't look like improvements to me). I even think Apple will present an "iPad Pro" along these lines, this year, with a killer feature of being able to run OS X apps. I don't live in Apple-land and I don't want that, but it should be popular.