Groove bits

I've been seeing all of the great pictures of wire wrappings that utilize the groove around the stone. I've got an Inland grinder that my wife used for stained glass and want to get a bit for it to grind the groove in the stone. I've seen Gryphon bits, Glastar bits, etc. That will cut the groove. I know some people have definite opinions on which brand diamond wheels to use on cabbing machines so i'm wondering anyone has any preference for these diamond groove grinding bits? Which brand cuts better, faster, lasts longer? Or all the same?

Thanks,
Walker