TLDR: Son hubs have the lowest drag but consequently less light/power output, Shimano provide lots of power but are very slow, SP somewhere in the middle, best light/power output of the hubs above 20kmh but not great drag wise
So, no reason not to buy an SP hub. Which is good, coz I've just bought an SP hub ;)
@hippy started
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TLDR: Son hubs have the lowest drag but consequently less light/power output, Shimano provide lots of power but are very slow, SP somewhere in the middle, best light/power output of the hubs above 20kmh but not great drag wise