just the price....
as long as it has oil pressure it will be healthy, if it surges it will do dammage regardless of the oil used. i have seen engines that use all those oils and still spin bearings.
and with any oil once it gets over 120~ degrees it breakes down and wont lubricate as well. a 15w50 is a good wieght for a stressed motor. thicker than a 10w50.