I think it depends on the applications you use. While I was waiting for this surface to come out, I was using the iPad for note-taking. However, I was limited because I couldn't use the iPad as a computer for other tasks at the same time. With the surface pro, I can do both.
However, you have to recognise the disadvantages of the surface pro compared with what Mac has to offer: for intensive use, the battery life is shorter, and it heats up a bit more, and from time to time the fan works, but with little noise.

On the other hand, with the surface pro I was able to upgrade without any problem from the smallest hard drive sold, and install a 2 TB hard drive in its place for < 200 chf.