After expressing my disappointment at the Swytch bike kit Yose sent me a kit for comparison.
This video is that comparison and little bit on front-wheel drive vs rear-wheel drive.
Yose kits - https://www.yosepower.co.uk/?ref=rxgywmdw
£10 of with code - DAVIDMCLUCKIE
Swytch kit - https://www.swytchbike.com/