Im a powerstroke fan so don't get me wrong. The 7.3 never "brought" anything to the cummins. The 7.3 is so limited in performance terms. It still will not last as long as an old 5.9. I've seen million mile 5.9 never a 7.3 but I have seen a 7.3 with 500k.. the one thing a 7.3 has is staying power. It is the only real survivor from the early years that is still desirable, mainly because of the trucks they were put in, not just the engine. You just don't find many older dodges because they fall apart around the engine. I've actually had 7.3, 6.0, 6.4 and 6.7 powerstrokes. If I had to pick only one to drive, be comfortable in and be overall satisfied it would be a 6.7. So unless you have put years and thousands of miles in each you are just playing a favorite because its what you currently drive.