The U.S. equivalent to JASO MA is anything SG or higher without energy conserving. I have found from browsing the oil shelves at the parts stores, that any 10w-40 motor oil does not contain energy conserving on the API Donut label.
I use Mobil one High mileage 10w-30, because one the service manual and owners manual recommend 10w-30 and two the high mileage Mobile One is the only 10w-30 I can find that is SG or higher without energy conserving on the API Label. I also figured that my bike had done more sitting than being ridden for most of its life, it could benefit from some high mileage oil. Of course that was my call.
I have used Mobil One motorcycle specifically formulated oil, but have found that it doesn't hold up as well as the Mobile One High mileage oil. I can feel the difference in how easily the transmission shifts. With that being said, I regard the API Label as very important. Since the Mobile One High mileage oil bottle contains the label and the Mobil one Motorcycle specific oil does not contain the API label any where on the bottle .
Motor oil use is a very touchy subject, because everyone will have their objections and differences in opinion. So, to each their own, My self, personally have used the Rotella motor oil and the only pro I can see to using it was the price.