Many businesses are hesitant to move to the cloud because of concerns about security. Especially when dealing with Enterprises’ sensitive data in the public cloud, As the use of cloud computing grows, the importance of cloud security grows as well. In this paper I made a comparison between 3 top cloud service providers (Microsoft azure, google cloud platform and amazon web service) Related to the most security concerns that should be kept in mind before making decision to move to cloud such as (encryption in transit, physical security, access control, disaster recovery plan and penetration test). I also provided some recommendations to over come these concerns and weakness from the provider and organizations side.