Both distros top in 260 countries; From the report:
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Ubuntu and Red Hat Linux are the most used Linux distributions among the 35,000 members of content-management vendor Alfresco's community, the company found in its second survey of trends in enterprise open-source software usage. Alfresco collected data between July and December of last year, with survey participants coming from 260 countries, according to the company. Fifty percent were from Europe, the Middle East, and Asia, while 24 percent were in the U.S., and 26 percent from other nations, Alfresco said.