I have a 420DIT and the worktools interchange (or at least they did) between the Cat backhoes, small wheel loaders and telehandlers. I am not sure what kind of coupler the other brands use but I don't think the backhoe couplers are as standardized as the Bobcat skid steer coupler. Cat calls it's IT an Integrated Toolcarrier. The linkage on the loader arms is a parallel type instead of the standard Z-bar type.
The IT's have more pins and bushings with more maintenance/expense in the long run. If you don't need to be changing attachments often, I would not consider one. If all you need is a bucket and forks, then the "over the bucket forks", the type with the hooks welded on the bucket and you can slip into them, are a better and cheaper option if that is all you need. Plus the over the bucket forks actually provide more visability than the IT forks due to the fact the forks hang below the bucket. I have this type of forks for my 953C.
https://www.heavyequipmentforums.com/Forum/showthread.php?t=2748&page=3 Post 33
With that being said, if you need different attachments and ones that use hydrualics, then an IT is the way to go. If I had it to do over again, I would have purchased a regular 420D and welded fork hooks on it. I really don't use the options the IT has for the type of work I do. Although I would like to have an angle broom for the 420DIT one day but they are so expensive.