The problem with quick hitches are they were invented long after 3pt was invented, so older equipment, or companies slower to "see the light" may not fir the traditional Speeco type quick hitch. As stated, some adjustment may be necessary (including welding), or upgrade to more modern attachments.
As far as Cat 1 vs. Cat 2, most equipment (except the real farm stuff) is cat 1. IMO you would be much better getting a cat 1 quick hitch as it will fit your equipment, and then simply remove the quick hitch and use the standard lift arm hook up if you should ever get any cat 2 attachment.
I have the Speeco and also a John Deere iMatch and love them. We live in farmer country and all the farmers here use the big CAT 3 quick hitch. They can back up to the equipment, lift and go, without leaving the cab. Seriously. I can do this on some of my equipment, and on some, like my shredder, I have to get off the tractor for the PTO and top link. The time spent adjusting my equipment was well spent.
The hooks welded to the side of the hitch have been very handy. In one photo here I use the quickhitch with a chain to lift the very heavy hitch of a 14' disk up to my draw bar. The orange hitch is a JD iMatch to which I added a Bobtach connection.
Before you make up your mind, go see you John Deere dealer and ask them about iMatch and Frontier implements.