Craftsman is far from being the only hand-tool manufacturer who offers a lifetime warranty on their products.Snap-On, Mac, the Kobalt line of tools sold through Lowes, the Husky-branded stuff sold at Home Depot, etc etc etc all carry a lifetime warranty.
Shoot - I think Auto Zone even has their own in-house brand of lifetime warrantied handtools now!
As to the actual question, though, it would be hard to say who actually makes the best tools. It's going to be a very subjective thing.
Personally I like Craftsman simply for the ease of replacing anything that's broken. You don't need a receipt, any sort of proof of purchase or anything like that. All you need is a Sears and a Sears employee with a pulse so they can work the register when you go in to make your exchange of a broken tool for a new one.
That's FTmfW //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif