Good day, I have the Surface Pro 4 core i7 and I am pretty much happy with it, I wasn't at first but with all the updates it fixed all my problems and now I like it so much. So I recommend it to my brother, but the price for the Surface Pro 4 i7 with keyboard is near the price of the Surface Book core i5 with dedicated GPU. So what do you think? Performance wise, which is would perform better? The Surface Pro 4 with built in GPU but core i7 or the Surface Book with dedicated GPU but is core i5?