ThinkPad Twist vs Ideapad Yoga... what's the difference

[fjs08]

ThinkPad Twist vs Ideapad Yoga... what's the difference??
Why is one a "Thinkpad" and the other an IdeaPad.

Looking for something cool but dependable that I can use as an everyday computer, but still take around to my coffeeshop<g>.

Can we include the X1 Carbon in this discussion too. Guess it's NOT a Win 8 box, but I'm sure it "plays" Win 8.
Thx for information.
Frank