Can't help you on the magnetic, but I've recently switched over to quality flat pedals with pins on all my bikes, including my road bikes and have been very pleased with the results. Originally went back to flats because I was getting cramps in my feet with clipless and would have to stop and unclip and massage the foot. Going flats solved the problem because I can now move my foot on the pedal when I feel a cramp developing. No more cramps, now, and no more having to stop.
As for the supposed loss of efficiency or power by going flats, for me it didn't happen. Using shoes that gave me good grip with the flats, testing it many times and keeping records, my average speed over the same stretch of 20 miles of pavement on the road bike, alternating clipless with flat, saw no change in my average speed. Zero. Zip. Nada. Felt a little funny at first with the flats, having gone clipless for so many years and I did have pay more attention to a proper pedal stroke with the flats, but won't go back to clipless, now. Will be selling off my clipless pedals.
I realize this is somewhat controversial and contrary to what so many of us have been told about going clipless to be more efficient and so on, to the point of no one questioning it, so I mention it only as an option. Nice to have choices. Don't want to start an argument with anyone, so I hope no one is offended or upset. (Some people will bite your head off if you tell them flats are as good as clipless - ask me how I know.) Flats work best for me, but that doesn't make them best for everyone.



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