Well you're entering the universe of the alchemists as most of us job shop types hardly ever get to use the "correct" wheel. Only whatever is in inventory so we end up picking & choosing something we "feel" will be correct, add in experience, gut feeling and which way the wind is blowing to determine the "best" wheel. Norton published one of the best, if not the best grinding wheel selection guide ever. Of course that was back in the stone age pre-Internet. You can go here: Norton Abrasives United States of America & Canada to see what they have to offer. Or Google grinding wheel selection.
Another very good reference is the Machinery Repairman 3 & 2 found here: https://eric.ed.gov/?id=ED203130 it contains a boat load of info and is the book used to train new MRs in the US Navy.