Both of those laptops are 13.3" screens. If you have 1-2k to spend, take a look at the Sony Vaio Z. It's very lightweight with great battery life but it has some muscle under the hood as well. It's what I'm hoping to purchase for college next year.
I wouldn't recommend a Sony for a business goer - too cheaply made to take the potential damage. The Lenovo is as close to a tank as you can get these days, has good battery life, and the 13" screen will be just fine for word and powerpoint. IBM machines also have a pretty good reputation and are, in a sense, the "real" professional notebook.