I'd say that nobody really knows the difference between an excavator and a trackhoe. There are many definitions. For me, and most of my friends, the tracks make the difference. Rubber equals excavator. Metal equals trackhoe. Manufacturers all have their definitions too. It's kind of like the difference between a pond and a lake.
If you get a rubber tracked diesel machine, I think you'll reall enjoy it. It will also have a dozer blade, which you will find invaluable for making small ponds.
