just to warn you, theres so many thread regarding oils already posted. search the topic..i bet you'll be surprised.
to answer your question tho. i use amsoil. its a good synthetic. i use amsoil everything..premix, chain wax, gear oil (trans), and coolant.
lots of others will tell you klotz, yamalube, benol, as long as the engine is getting lubricated while getting fuel, you cant go wrong, as long as its mixed correctly.
its mostly about preference.