I kinda like the hill chart but TBH it shouldn't look like normal distribution, but more like a half-circle. In my experience, most (SW) projects (at all levels of granularity) are S-curves (and not straight lines like in burndown chart). You're slow at beginning, because you're learning the domain and finding good abstractions. You're slow at the end because you're working out the kinks and fixing little details. The fastest progress is in the middle. So if the hill chart is supposed to show the difficulty in progress, it should look kinda like a derivative of inverted S-curve.
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I kinda like the hill chart but TBH it shouldn't look like normal distribution, but more like a half-circle. In my experience, most (SW) projects (at all levels of granularity) are S-curves (and not straight lines like in burndown chart). You're slow at beginning, because you're learning the domain and finding good abstractions. You're slow at the end because you're working out the kinks and fixing little details. The fastest progress is in the middle. So if the hill chart is supposed to show the difficulty in progress, it should look kinda like a derivative of inverted S-curve.