Market Share for Smartphone OS.
Based on the chart of worldwide market share, the android os cover the range of around low 80%, while Apple iPhone os covers the range of around 30%.
Based on the chart of US market share, the market share of Apple iPhone s cover the range of around the low 60% while android covers the range of around 50% hence the Apple iPhone Os is the best smartphone operating system for US market share.
References
Stair, R. M., & Reynolds, G. W. (2018). Principles of information systems. Boston, MA: Cengage Learning
Stair, R. M., & Reynolds, G. W. (2001). Principles of information systems: A managerial approach. Course Technology.
Stair, R., & Reynolds, G. (2017). Fundamentals of Information Systems. Boston, MA: Cengage Learning.
Ireland, S. most poplar mobile operating systems in the United States (android vs. IOS) market share 2012-2018. Retrieved from https://ceoworld.biz/2019/01/17/most-popular-mobile-operating-systems-in-the-united-states-android-vs-ios-market-share-2012-2018/.