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Re: Gears or chain and sprockets?
There are more options in terms of ratios for sprockets than gears, but the chain is considerably weaker than the teeth on gears (although they are far from impervious as well). You can double-up on both chains or gears if they stress is too high though, and some have used tank treads for transmission of power over long distances (such as FVC 40 and 1281). Gears tend to take a bit more meticulous designing to get them to fit properly than chains do (especially in FVC), and gears cannot have anything between the origin of power and the output of power, aside of the gears (while a chain can go around an object or spacer).
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