Years ago (1960s 70s) I just put whatever oil was available in my bikes and scooters.
But as engines have changed and rev higher especially my little Forza which I tend to run flat out a lot of the time, I thought I should read the JASO MA/MB tech bumf but quite honestly I was none the wiser
I just thought best bet was to go with MB as that was what the handbook said - next time I might try golden syrup.