I haven't tried the Surface Book, but you're lucky if you can even fit three or more fingers on the trackpads on the Surface Pro. Maybe MS could show some leadership there as well.
http://i.imgur.com/rynFtJQ.jpg
The MacBook Pro Trackpad is 206% of the size of the Surface Pro 4 trackpad. Literally double the size.
I don't remember noticing much difference between the covers on the 3 and 4, and I find the trackpad on the 3 is bordering on unusable for anything that requires a large range of movement.
I really like the Surface as a hardware product, but the type covers are just gross.