I can see the more we get into the intricacies of hill driving, the more the answer shifts towards "it depends" (TM).
Maybe as a rough guide, things could be clarified if we gave an example hill, eg. a small/medium bridge/overpass, with a moderate slope, no stop on the other side, absent following traffic. Ranking hill driving technique from worst to best might look like this:
1 (worst) - constant speed, or cruise control (or mash the throttle up, lift on the descent)
2 - constant throttle
3 - constant load (DWL)
4 - pulse up / glide down (engine off)
Missing from the discussion so far: I often read about people who do a modified version of DWL where they build additional speed on the flat before the hill, and then bleed it off on the incline. I've never tried to quantify it, but my guess is that it would slot in between 2 and 3.
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