There's a good reason for that. Because your opinion is correct, it is superior in every possible way. That doesn't make the 6.0 a bad truck, quite the opposite. But the 6.7 is two generations newer, if it werent superior then Ford would have a major engineering problem on its hands.
Thanks. I'm sure that is a helpful post for the OP.
Is the 6.0 a bad truck? I can tell you it wasn't fun being stuck on the side of the road with a trailer attached - happened more than once. They definitely have their problems but the aftermarket has the fix for them now. I had my truck for 10 years and a lot of good miles. I also had several trips that needed to be extended and extra costs added in hotels/meals not to mention having to burn extra vacation days. If you're going to tow, I wouldn't own a 6.0 unless it was bulletproofed.
Here is something to think about. How much time and/or money are you willing to put into a older truck. I ask because the reality is you won't get that money back. Out in the market, that money & time isn't going to net you any return in resale or trade-in. While it is fun to work on your truck, that time is worth money too.
My '04, which I had set up just how I wanted it, had a blue book value of approximately $10k when I bought my new (2015) truck. IIRC
it had over 150K miles on it. Unfortunately, it was pressurizing the coolant tank even though it was bulletproofed with studs, etc. Another bulletproof was going to cost me roughly $6k-$7k. This is assuming the heads & injectors were all still good. On the interior, the leather seats, despite my best efforts of care, were getting pretty bad with cracks in the leather. Leather on the steering wheel was pretty tired. A full brake job ( including disc = hassle & expensive on a dually) was going to be needed soon. You get the point.
In my case, I didn't feel it made sense to 'restore' my truck. I was guessing I could put in excess of $10K into the truck but it would still only be worth $10K on the market. On the other hand, say I spent $15k on my truck & drove it for another 10 years, I'd be $40k ahead versus what I paid for my new one. As always, YMMV.