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Agree with Chris–I don’t think there is a general answer to this question. Type of bearing isn’t the only factor.
I have Elgins and West Bends that are all roller but 16-1 is recommended. I run them at 24-1, same as my older OMCs that are partly plain bearing. They might run for years at 50-1, or they might not. The safest thing, of course, is to do as Fleetwin says.
OMC at one time said the little twins (3-4 hp) with all plain bearings could run at 50-1. Maybe; they likely had very low bearing pressures. But I would run them at 24-1. Forget running 100-1, and look with extra caution on motors from the 100-1 period.
Just my thoughts; this is an unending subject.