A stump grinder would be overkill and not cost effective for saplings. In this case you would be grinding through more dirt which isn't the proper use of the machine. The OP is clearing a decent size area and probably wants to remove as much root system to allow replanting. A mattox runs the risk of damaging other things unintentionally. Irrigation, gas , electric or low voltage might be in that area. Its a finesse tool that I have and use only in certain circumstances. Its not something I would buy if cost was a concern.
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