Metal gridner, or plastic. Does it matter?

[Nochowderforyou]

if the teeth on the plastic are wide based theres no difference other than one is metal, one is plastic

That, and the plastic ones, they have the plastic teeth, those very easily break just by putting a dense nug in it.

Try and find a wooden one w/metal teeth. I use one of those and it works great.

Metal is the best though, casing and all because, over time resin builds up, and a metal one doesn't get sticky or hard to turn.