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The SONdelux is designed to give the same output for higher wheel RPM, so it depends if you're going to be able to keep the speed up. For ultra stuff I would have thought you don't want to lose lights when you get tired/are dragging your sorry self up a hill at 2am in the rain, so the SON28 is maybe a better idea.
Edit: here's a link to the Schmidt website where they discuss this (in german, sorry).
hamrack
@Brommers
For a dynamo hub for a fast tourer/bike-packing/ultracycling bike do I want a Son Delux or the 28? For lighting at night and USB power bank charging during the day.