I've both a macbook pro retina, and an SB i5 ogpu. Here are my thoughts :
for the surface book :
- the screen is gorgeous : the definition, the aspect ratio, and the colors blow away the macbook pro
- keyboard is a little better, you have a little more key travel and it feels a tad better
- battery life (but that might depend on which version of the retina you have : mine is a 2014 i5 haswell 13 inch version
- windows is better for some programs (microsoft office)
- having the pen option, in one note, is great
- the detachable screen is quite useful
- last but not least, the concept is innovative, and fun
Now, not everything is perfect :
- Bugs : even if it's waaayyy better than at the beginning, you still have the occasional black screen when you detach / reattach the book, or the once every two weeks BSOD
- form factor : there are two limits to the form factor : first of all, the weight repartition is different than a classic laptop, with the top being more heavy ; for me, the issue is not that the computer tries to fall from my knees (which it doesn't), but it's more than when you use it on your lap, the center of gravity is more towards the hinge, and it's a little less conformable, for the keyboard tends to raise a little. So the natural reaction is to apply more weight when you type. in the end, it's not a real problem, but when you compare it to the mac, it's a little less confortable. the other issue is that the opening angle is not as wide as a traditional laptop, so when you use it on your bed, it's not as good as a traditional laptop.
- trackpad : the SB trackpad is a very good trackpad... for a windows machine ; but when you use the trackpad of the mac, you see that there is still quite ? good difference between the two.
- microsoft quality control : I bought two surface successively, the first one had major light bleed, and the second one had some issue with the screen resistance when you write (some halo effect). Finally, I sent back the second one, and kept the first one, as my belief is that there are very few perfect units of surface book out there, probably because microsoft factory quality control lacks consistency. and I can live with the light bleeding. But when you think that the machine cost more than 2000 €, it's unnerving not to have perfect quality. The mac is way closer than perfection in that aspect.
Now after two months of use, I like the SB, because it's innovative, it's a great machine for work, but it still has a few quirks that sometimes push you back to the mac. as for the mac, it's not as innovative, there are some things that you're lacking after having used the surface book (touch screen interaction, pen, MS office on windows...), but in the end, it feels more rounded. if you compare it to 80's cars, the Macbook pro is like a mercedes benz SL. It looks good, it works all the time, you can rely on it every time. The surface book is more like a ferrari : it's good looking, very fast, way better in some aspect than the merc, and not as good in other. If you have enough money to have both, then go for it, it's fun. If you have money for only one car, going for the mercedes (the mac) is probably a more secure choice, cause it will never let you down. It's not as shiny and new as the ferrari, but it will last a long time, work well. Maybe the surface will be as good in 1, 2 or 3 generation, but you feel like the main issues the mac had at launch (ghosting issue, yellow taint screen, etc.) have been ironed out. As for the surface, it's not the case.