Magnetos are actually pretty reliable. There's a reason piston aircraft use them, though admittedly they do double up on them and everyting else in the egnition.
The H4 on the SuperA was a time tested and reliable mag, as well.
Only drawback I can think of is that on those rare occasions that somethng does go wrong there are things to a mag that not just everybody can fix, where a battery ignition distributor is pretty much a mechanical affair.
The big advantage to a mag is that you're not hostage to any of the things that can go wrong with a battery ignition (generator, cutout/VR, bad battery, a short anywhere, leaving the lights on . . . coil -- a mag has a coil, but it's not prone to the same kind of failure as the oil-filled cylidrical coils on the battery igntions). A magneto ignition won't die for any of those things going wrong and if you've got a hand crank you can start it and run it all day.
A little more difficult sometimes to fix, but less likely to fail and/or strand you is my view of a mag.
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