I guess it depends on your soil, and how you want to use the tool. I was all over our ladies mattock, when digging into the side of a mountain, which was taller than us. Because I had to lift it above my shoulders. But at foot level, I prefer the heavier mattock. One swing and you can take out a big chunk of clay. I didn't like having to chip away with the smaller one, barely making a dent. I actually found the jarring is worse, without the weight behind a heavy mattock. For finishing though (shaving off small amounts to make the ground even) the lighter mattock is great.
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