Do you actually believe yourself stillshockedyouuthinyouknowwhatyouaretalkingabout?
I would guess that you just haven't had your wallet emptied, or been embarrassed publically by a tuned 6.4L yet. If you keep talking, you will find many takers looking for someone like you..
Now, the 6.7L is a very nice, powerful, efficient engine that should make anyone happy, and probably the best stock tuned powerstroke yet because of a better emissions system. I plan on buying one this spring, but I know what to expect.
Just do a search on 6.7L problems when tuned with few aftermarket hardware applications. You will see things it can't do, like keep rods, pins, fuel and other things intact.
So, if you plan on keeping your engine stock, there is no other option than the 6.7L for a sweet running stock engine. If you feel like stepping things up, buy the 6.4L. But DON'T start trash talking because you won't like the results.