I own a Surface Pro 3 and I will be buying an iPad pro. The Surface Pro 3 for Visual Studio, and the iPad Pro for music production. The markets are completely different.
That's interesting to me. What does the iPad Pro give you for music production that a Mac with Logic (or your DAW of choice, whichever) doesn't do better? Even if you want touch controls, I've found a regular iPad to be plenty big enough for Logic Remote/TouchOSC/Lemur, and it talks to a much smarter, much more featureful system.