From what I understand - admittedly limited to limited experience, YouTube and some research - hand sharpening is probably better and can be done a whole bunch of times, (like maybe more than 10, 20, or whatever). But... you have to really do it right. And it really will take longer, unless you're well practiced.
With Dremel method, I'm probably sloppy, and maybe I get five fresh sharpenings out of it because it does take off more stuff, partly due to nature of power tools and as likely, my own probable lack of skill. But it does work! After that, I've got to buy a new $15 - $25 chain. (With the sharpening kit having been maybe $15.) So the ROI on the kit is basically ONE sharpening. Then it maybe saves $50. Of course, as a basic homeowner who's only using this intermittently, we're talking about a new chain only every couple of years.
If I was a pro or cutting all the time? Or out in the woods away from power? The time / money issues might change.
(It helps that I've learned to REALLY avoid touching dirt, which trashes the teeth in no time.)
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