Well...you can't really warranty either of those in the US (as far as I know) you probably will with snap on if you buy it from them (not from a third party) so the warranty might be worth it to you if you plan on using it a lot.

Then again, not sure it will be much of a difference from other truck brands except in price.
Or...you can get a brand with a mail in warranty like sk. Honestly, in the "US brands" there isn't going to be much of a difference in quality, they'll all be smooth as butter if they're new and fine tooth.