Its not really so much of a differentiator. At least not without some additional clarification.

Addressing Office 365 Customer Concerns about Data Geo-Redundancy and Location - http://blogs.technet.com/b/uspartner_ts2team/archive/2013/06...

Where is my data? - http://www.microsoft.com/online/legal/v2/en-us/MOS_PTC_Geo_B...