I'm wondering why you would want that touch keyboard in the first place. If their laptop-style keyboard is just as thin and it gives you tactile feedback, what's the reason for touch-only style?
Sounds like the touch keyboard is a slightly better cover, and slightly cheaper. I think if you want a laptop replacement that can be used as a tablet, go for the real keyboard. If you want a tablet that can occasionally double as a laptop, get the touch keyboard.
The laptop keyboard is in no wise as thin as the touch keyboard.