I do both and don't really notice a difference between the two.
When I've got clear road behind me I P&G between 55 & 35 in neutral with my foot off the clutch so I don't have to Fred Flintstone the clutch the whole time.
When I'm in traffic my P&G is more like 55 to 45, so the glides are shorter. I usually clutch it then, but even then I'm throwing it in neutral sometimes.
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