HP Spectre x360 - the best Surface Book Rival?

Considering specs, price, and availability, i'd say the Spectre 360 is the best competitor for the Surface Book.

But, in my opinion, the detachable display is a significant difference maker between the two devices. I'm currently a Surface Pro 3 user, but i'd like to move to a Surface Book (or Surface Book 2) in the near future. I detach the display on my Surface Pro 3 all the time. For media consumption, for passing it around during a meeting, and for teaching from.

If i'm using a 2-in-1 device as a tablet, i don't want to have to have the keyboard attached to it.

So for that reasoning alone, i'd still stick to a Surface Book over an HP Spectre.