Technological advances in cleaning up dino oils have brought base stocks pretty close to ester-based synthetics, but the cost has also risen. Pretty much the new technologies do a better job of removing impurities and rearrange the dino molecules closer to true synthetic. Any synthetic specifically for motorcycles in the proper viscosity for your weather and riding style will do. I use Mobil 1 because I found good quantities at a very good price. Royal Purple, Redline, and Amsoil are also very good, but prices are high. These four lead the pack in lab and real-world testing, but the others are catching up.
Avoid oils intended for diesels. Recent formulation changes have left these oils with insufficient ZDDP to protect TW cams and rockers, and additives that improve fuel efficiency put TW clutches at risk. Your national government at work, making life difficult.