I'd opt for a Surface Book, mostly because I did
Solid design, premium feel, no crapware installed. Great all around computer.
No buyers remorse, short of that its running windows. I don't mind Windows, and prefer it for a number of situations, but I also like OS X.
I wish they have a 15" Surface Book. The only reason I went for MacBook Pro is because neither the surface pro nor surface book have 15".