Glass and slate turkey calls are better suited than the other for specific situations. Both are fantastic instruments that can produce a wide range of sounds. And depending on the day and the gobbler, one might work better than another. Many veteran callers favor slate for early-morning hunts because the surface still plays well on spring mornings when it’s particularly humid, and glass surfaces can be finicky when they collect any moisture. However, if you’re trying to strike-up a distant bird in the middle of the day, glass calls often produce louder, higher-pitched calls than slate.