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boredom
Difficult to say. There are pros and cons to both. The main benefit of having a crank-based powermeter is of course that you can use different wheels on that bike and still have a power meter. The advantage of a Powertap is that it's easy to switch from bike to bike. How many bikes and how many wheels? If the answer is one bike and one set of wheels then provided you're happy with Ardennes SL rims and the rims are genuinely 'a bit worn' rather than 'totally fucked' then the Powertap looks like a good deal.