The real debate is there a difference between specified motorcycle oil and either automotive or high performance automotive oils? I beg to differ and I think it is a marketing scam and gimmick to slap a label and charge you more for a name, especially for full synthetic oils... Conventional and synthetic blends are a toss up, but I don't use them, well, conventional only when breaking in a motor is when I use it, then after a few hundred I change it.
When I hit the 500 mile marker, I changed my oil to what I always do, Lucas full synthetic oil 20w-50 and Lucas full synthetic oil stabilizer... Or Amsoil, depending on the budget or build. I used to use Royal Purple with their Synerlec I think, and it was good and performed at high heat but jumped up wayyyyy too much in price... I use Lucas 20w-50 in my DSM (10 sec all wheel drive turbocharger) and in my old GTP (12 Sec front wheel drive supercharger). On high performance vehicles, especially those that use the oil crankcase to power their turbo or super, best quality oil is needed, on a separate system like the M90 Eaton blower, that supercharger has it's own internal oil crankcase, so that also has intervals that needs to be replaced and checked.
Honestly, coming from the standpoint of where I am now, full synthetic is all I trust and bet my $$$ on, for the times of people forgetting to change their oil, conventional oils would destroy engines in no time with sludge and turn to gel (I have taken apart engines like that), so full synthetic is also a little more forgiving and runs a crap ton cleaner than conventional.
2001 Kawasaki ZX-6R Ninja (RIP)
2016 Harley Davidson Street 750 (modded)
1998 Eagle Talon TSi AWD (10 sec baby)
2001 Pontiac Grand Prix GTP (High 12 tugboat)