X2/3 Carbon vs. T440s

[sjahanmi]

I'm debating on which 2 machines to get, the X1 Carbon Haswell refresh that's slated to arrive next month (codenamed X3 Carbon I think) or the T440s. If we put the 2 side by side, with the same exact specs (ie, 4th gen i7/ 8gigs ram/ 256 SSD), which one would be better in terms of overall performance, speed, reliability, durability, and battery life?