Are you looking at Spectre or EliteBook X360 or the consumer version, whatever it is called. I've had surface, surface book, Spectre and Elitebook. Not had Surface laptop what was a bit underwhelmed when I checked it out. Not really an "enterprise product" in my eyes.
At the core of it, they all do the same thing more or less... It just comes down to how you use them... few grammes less or a port or two more.
I'd like to help but I am drawing a blank as to what to highlight really... What do you want to know?