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Thrasher
Some Russian guy did some great testing. The info comes from that. I'll dig it out if I can remeber it.
I think it's still a good option on road, just not as clear cut as off road. And I think the new one when released will be again clear cut.
The russian guys research also make the case that you need to consider dynamo too and its interaction with the light in question.
https://www.cyclingabout.com/dynamo-hub-power-drag-testing-schmidt-son-shutter-precision-shimano/
https://skjegg.blogspot.com/2020/02/dynamo-hubs-for-your-pleasure.html