Well, if you want to build American rigs from the 60's-70's, go with AMT (now AMT-Ertl). If you want to build American rigs from the 80's-present or European rigs, go with Revell of Germany or Italeri.
UPDATE: Also, according to Tim, the fenders on the AMT Peterbilt 359 are a bit too short in the front, so if you want more accurate fenders, either kitbash them from a Revell 359 or lengthen them with Evergreen plastic.