If I lived in an area where regularly pedaling the bike to the top of the hill was needed, I think I would choose the derailleur bike. I generally don't mind grinding a heavy bike to the top of the hill, but the 17kg gearbox brute was a bore. I couldn't calculate how much, but the Pinion bike does drag more than the derailleur bike with a clean and lubed chain. The derailleur bike had more inherent anti-squat in easier gears, which made climbing easier by sitting the bike higher in the travel and pulling the bike up and over steps more easily. Technical climbing is also made more difficult on the Pinion bike; the pair of freewheels increase the engagement interval, which hampers quick, half-pedal strokes when things get trialsy.