If you travle a lot, X is the best. T is too big and

heavy. Especially on airplain, X is much easier to use & carry than T.
X is much lighter and stronger. It is less possible to be damaged that T.
Also, X last much longer on battery.
If you carry the laptop with you everyday, X is much better than T.
X200s is better than X200. X200 tablet is also nice, even though tablet is heavier and thicker than X200s, it is easier to use, especially outdoors or in the car, where there is no where to put the laptop steady.