Cats and dogs are comparable.I said comparable, not identical. There are tasks with both that aren't really doable with the other, can't really put a turboplane on a bench grinder, cant hog off metal like you can with a stationary grinder with a handheld, they've both got their uses. My comment was just that 90% of those uses overlap, same as the table saw/RAS debate
You need to list the 90% of things that can be done on either. Then list only the things that can be done be either.
Here are some things the angle grinder can do that the bench machine cannot.
* Polish the props on my boat.
* Cut concrete/bricks
* Hog out the contours on a chair bottom.
* Clean rust on a flat surface.
That is just a start.