If you aren't towing, go with the 6.2. No reason to have like 800 lb-ft of torque if you aren't using it, especially when the 400 something lb-ft on the 6.2 will get you where you need to be anyways. The horsepower on either model isn't to far off from each other, so it's not like you're sacrificing that much of the punch by going with the 6.2. If it's a highway driver, which I'm sure it is if you're getting it for work, you'll be thanking yourself with it in the long run. Overall, it's your decision, but if you have the money, and if you plan on running truck in the hundred thousands while doing a lot of pulling, go with the 6.7. If it's just your daily driver that you aren't pulling all the time with, which you plan to replace in a few years, be practical and get the 6.2. If you don't mind me asking, what year? And are you financing or leasing?