Either of them are a great towing motor. Yes the 6.0's have a bit more lag to them but that can be easily remedied with an aftermarket chip. The big advantage with the 6.0 is you get away from the problamatic injectors they had on the early HEUI system.
Had a 2003 with the 7.3 and now have a 2005 with the 6.0. I tow a 10,000lbs trailer and hands down the 6.0 is the better tow truck. I tow from NYC to the Florida Keys and I would never go back to the 7.3. I did not dislike the 7.3 in any way... it is just that the 6.0 with the tow/haul and break controller is just a better a tow truck.
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