Motorcycle oil is "Supposed" to have additional antiwear additives...but quite frankly only way to be sure is have analysis done as to what "secret sauce" has been added (if any) to justify the higher cost with documented evidence. That said, oil selection is still a personal matter of choice, plain and simple. As any results good or bad you may have is statistically lost by the number of users actually using the product successfully or not.
That is why we have the Oil polls...here at HDTimeline. Talk and speculation is trumped by the dollars and use the owner spent. Motorcyclists as a whole PREFER to use motorcycle oils when it comes to that final decision...few have actually done the research and based their decision on recommendations...! Branding is a major influence, as is word of mouth...I'm no oil expert, but I trust what I use over the years, and in the final analysis, if you change oil often and do not stress it over it's life when you ride, you can be comfortable in what decision YOU make...! Smitty901 changes the oil at recommended intervals and he uses his bikes often...no problems, others have used same and have had problems 2 or 3 years down the road, but was it the oil?