>>1996264belt is pretty nice, i like how silent and maintenance-free it is. as for gear hubs it really depends on the type, nexus 8 is way more efficient than nexus 7 for example, and alfine is generally better than nexus.
personally though i really enjoy going fast and don't mind doing maintenance, and also commute outside of urban areas so ever since i bought a derailleur bike i haven't touched my hub and belt one. but for city or casual use it's pretty great.
>>1996476please to be consulting the chart saar