I think Tom_L's first sentence hit the nail on the head.

I use my Dremel for fine grinding and polishing pretty much exclusively. The bench grinder can do easily what the Dremel only dream of and the reverse is true as well. I wouldn't give up either.
_________________________
"There is not a man of us who does not at times need a helping hand to be stretched out to him, and then shame upon him who will not stretch out the helping hand to his brother." -Theodore Roosevelt