I beleive that more importantly than the brand or type of oil one uses is the frequency of changing it often. I worked for A Honda, Yamaha, Kaw, Suz dealer in the late 80's through early 90's. Each brands own oil I found out was made by a typical motor oil company...same bottles different sticker and one of the honda tech guys secretly revealed to me that the GN4 oil I was selling for $2.95 per quart was nothing more than the same Kendall motor oil sold at the auto store for .88 per quart.
I feel like aq broken record but on a bike with one piston, running consistent 4,5,6000 RPM's, air cooled only, it is my opinion to change the oil frequent as possible more so than the brand you use. JMO.
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