Android’s Advantages are closely tied with it’s Disadvantages, not only compared against iOS.
Android is free. Android is perverted with bloatware and spyware by carriers and OEMs.
Were it for iOS to be licensed (commercially) to third parties, everyone — starting with Samsung — would sell their own mother to put iOS on their devices.
Android is available across a lot of devices (and price ranges). Android has poor performance and requires a lot more resources than if it were specialized.
Can you spot more advantages? Disadvantages? Make correlations?