Which grinding tool?


I would like to buy a grinding tool and don’t know which one would  be best.  I don’t want to spend a lot.  I do fused glass jewelry, plates, bowls etc.  I wanted something that would grind down edges so that they are straight or even, or bevel cuts.  I was looking at the gryphon belt sander or the 8″  flat top grinder.  They are both the same price approx.  Which would you suggest?

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