OMG shut up about the SP3 already. I hear Windows 10 isn't great for touch input. But that's the point of touch. It's for touch. Apple's solution to touch screen devices is start from the ground up with fingers as the input and slowly but surely add more powerful features. Apple's solution and philosophy is a far better one. If you want a SP3 go buy one and stop telling us about it. By not allowing desktop apps on your tablet it forces innovation for touch, for fingers, and devs often surprise you.
So, you've never used Windows 10 on a touch device? You're hardly qualified to weigh in here, then, are you?
You're making the same general assumption most people stuck in a single OS camp make - incorrectly. The Surface Pro is a laptop replacement. The iPad Pro will be a bigger iPad. They are still completely different animals. You're assertion that "...devs often surprise you." may be true, but still widely limited by the iOS platform and a purely mobile cpu (though they're getting more and more capable).
I can tell you, based on my personal experience going back to school for a nursing degree, that the Surface Pro is superior in every way to an iPad for educational purposes. The additional capabilities offered in the iPad Promthat we were shown yesterday get it closer, but it still won't be as useful in the academic environment. That environment, by the way, offers a direct parallel view into its usefulness in most business applications. I tried to bend an iPad to meet my needs for over a semester, and finally gave the SP a shot. It was immediately clear the SP was the proper tool for the job.
As a lifelong photographer, I find iOS a superior environment for image processing. I can easily imagine the new architecture and iOS will make the iPad Pro an indispensable tool for photographers in the field - whether shooting weddings, or in an actual field. Between my iPhone and iPad (along with a few correlated apps), I can get my images that need processing to 90% where I'd like them. The ease with which I can do it is exponentially better in iOS than on my SP or desktop, even though I have a deeper set of processing options there.
The bottom line will always fall under using the right tool for the job. Don't be so narrow minded as to convince yourself that a single OS or device will ever perfectly meet anyone's needs. That device doesn't yet exist.