Rear hub motor choice.

Decisions. Decisons. Which would make a better base for a stealth 48v-15A rear drive motor on a bike with mechanical 160mm disks and Shimano Acera 9sp rear mech? The Cute/QBK 10 CST using the existing 9 speed cassette, or the Bafang/8Fun SWXH with a DND 9sp freewheel. The Cute has a LHS cable exit which might be a bit neater. And the CST using the existing cassette might fit and work better with the existing drop outs and mech. Conversely the Bafang might be more robust and cope better with being overdriven. There may be some differences in disk clearance, spoke dishing required, drop out width and so on. The base bike is a Genesis Tour De Fer road touring bike, 700-35c tyres.

Anyone got any direct experience of the comparison?

My current ride is an Alien Aurora with a 36v350w BPM and a 36v15AHr LiNMC rack battery. I'm trying to put a bike together with about the same performance but lighter and neater with a better basic bicycle. The Aurora is a rigid MTB style, 26" wheels but low quality. I'm in the UK.

GBK-100CST 36V 250W e-bike cassette freewheel kit http://www.greenbikekit.com/electric-bike-kit/rear/100cst-cassette-freewheel-e-bike-kit-36v-250w.html
Bafang SWXH 36V 250W Rear driving conversion kit http://www.greenbikekit.com/electric-bike-kit/rear/bafang-swxh-250w-36v-rear-driving-e-bike-conversion-kit.html
9SP DNP 11T FREEWHEEL http://em3ev.com/store/index.php?route=product/product&path=41_56&product_id=113

So far I'm falling on the side of the GBK 100CST