what surface you had? what model?
I had the Surface 2. It was the RT version, but it's easy enough to get a feel for how the full version would work as it was mostly there--I just couldn't add my own programs to it. It's a very solid tablet/notebook and I had the keyboard as well. There's a LOT I liked about it. As an MS Office machine, it was awesome. But the OS made it a bit clunky. Windows 8 isn't sure if it wants to be a touchscreen tablet or a laptop. It throws you between an icon rich tiled environment and the standard "Windows 7" desktop you're familiar with. And that's actually quite jolting.
I think by the time Windows 10 comes out, they'll have worked through most of those issues, but I'd wait because of that. (Of course, it'll be free, so you can always upgrade, but if it's a bust, you don't want to find that out after the fact.) On the other hand, you know your Mac just "works." And that's ultimately why I switched. I don't have enough time to fight with my computer. I want it to work for me.
----------
The surface just looks cumbersome to me. If you want to use it on a flat surface, you need to use its kickstand and a separate keyboard. If you want to use it on your lap, you have to use it like a tablet. Neither of those scenarios sounds very appealing to me.. I would rather keep the traditional laptop form factor, the way the rMB does.
The kickstand is actually awesome--so easy pop out, and solid construction. And the keyboard clicks in so tightly, it feels like part of the unit. All that may look cumbersome, but it's actually extremely intuitive in use.
The OS, on the other hand, needs work.