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Slate is generally considered easier to play and has a more mellower sound usually. The soft clucks and purrs are generally what sets a slate surfaced pot apart from other surfaces. A glass call can do the same but usually can get louder and the yelps and cutts are sharper sounding. Personally I feel a correctly conditioned glass call will run as easy as a slate call and will do everything a slate call will do but a little better. Scoot