I don't use the Delta Hook, but I'm the one who wrote about Pat's Easy Change.
One thing that attracted me to the Pat's Easy Change is the fact that I can use it with implements that do not work with a quick hitch. I have 2 implements that will not work with standard quick hitches, and I doubt that either will work with the Delta Hook.
First is a Post Hole Digger, by its very design, it cannot work with the Delta Hook because the top link is not used on a PHD as the top of the PHD must be attached to the tractor itself.
Second, and this is just my observation, but the fixed dimentions of the Delta Hook MIGHT not allow it to work with implements that do not have a standard "A-Frame" and, unfortunately there are lots of those out there, and many are still in production. I have a Befco finish mower, I would not get rid of it, but it does not have a standard sized "A-Frame" and will not work with any of the Quick Hitch systems I found other than Pat's Easy Change. Looking at the Delta Hook, it seems like it has a plate that connects to the implement's "A-Frame" and it does not appear to adjust in either width or height, consequently it MIGHT be limited to only standardized implements.
All that said, IF I was buying a tractor and implements, I would certainly consider this system. There are a few others out there that are nearly identical, basically using a male/female coupling system. All seem sound, and all probably work well. For me, I've been using a PHD lately and the only think that works with it, my rear blades and my mower deck is the Pat's Easy Change . . . it is not perfect, but it is the best thing I could find that would work with everything I use, and it is economical enough to mount the system on each tractor.