Some coaches emphasize speed on the bases, some emphasize hitting. My experience is that the ones who emphasize hitting ability tend to win more often.
To a great degree all you have to do is compare hitting stats. A .370 hitter who gets a lot of leg hits is just about as valuable as a .370 hitter who doesn't get many leg hits unless there's a big disparity in power. The leg guy reaches on errors a bit more often but the guy with less speed has gotten more clean hits that drive runners in and move them up 2 bases. The legs guy steals more often but the pure hitter may have hit more doubles and moved runners ahead of him more.
If I've got a leg guy who is hitting .200 then that's what he is as a hitter. He isn't better than that because he's got wheels, he's hitting that much only because he's got wheels.
Defensively there's always an advantage to being faster, but it doesn't always translate to being a better fielder.
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