Running a high quality gear fluid not only ensures smooth gear change but is vital for the protection of internal components and gear faces / teeth. Your bike is unique compared to a car, it faces higher revving stressed use for a prolonged amount of time, that's why, unless you've a heavily modified bike, it's critical to stick to the gearbox manufacturers grade specification and(or) approvals specified in your handbook.
Some oils in this section may be suitable for "wet clutches", please check on an individual basis. Bikes with a wet clutch have the clutch and plates immersed in oil - the same motor oil as your engine, sharing the same oil. The oil flows through the engine and clutch, lubricating, cooling & cleaning as it goes both internal engine and clutch components alike. Motorbike oils that are suited to wet clutches have special additive packages within them to cope with the extra strain of operating in this manner, plus they have friction modifiers to prevent clutch slip. If you were to add the same grade car oil you'd find it almost impossible to ride without your clutch constantly slipping.