I would go with the Macbook, iPad pro doesn't run the apps I need for work and iOS is far far far too limiting. Hate windows for work, so not left with a huge amount of options.
Was giving the Macbook some thought the other day, but the screen size is putting me off, just seems a tad too small to be able to get my work done, and its far too expensive for a fun gadget. I would actual really enjoy a 14/15" Macbook, there are a lot of times where my work doesn't need a quadcore i7 and I think I would be fine with a lower powered CPU.