This one covered a while back Mike... and likely before that.... and before that...
Horses for courses...
I've fitted a contact-less system for no other reason than I enjoy tinkering; but has it improved the performance... not that I can tell. (though possibly starting is easier)
Why can't I tell? Coz she's an old gal... & I'm not going to be thrashing her. And besides, I'm not doing a great mileage to boot.
If gold coins are an issue, honestly, I wouldn't bother... Honda got it pretty right back in the 70's... in my opinion. Reliable, easy to maintain, and cheap. What more could you want?
Simon