Google Drive for Work offers 24×7 phone support and a 99.9% uptime guarantee. It include all of Google’s productivity apps like Docs, Sheets, Slides, Sites and Hangouts. Google is also adding enterprise-grade security and compliance, including a SSAE 16 / ISAE 3402 Type II, SOC 2-audit, ISO 27001 certification, adherence to the Safe Harbor Privacy Principles, and can support industry-specific requirements like HIPAA.
http://www.google.com/enterprise/apps/business/driveforwork/index.html

Microsoft said the landscape for online services is quickly changing and that merely providing cloud storage is table stakes. By providing 1 TB with Office 365, Microsoft effectively supersedes the storage-only providers. For those who only want online storage and not Office 365, OneDrive pricing has been cut 70% to $1.99 for 100GB and $3.99 for 200GB.