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Azure is actually very fast, and S3 has historically been a bit less than reliable.

(Full disclosure: I work for Microsoft, but not on Azure.)

[garblegarble]

Could you provide some outages you're referring to for S3 reliability? I've been using it for the last 4 years and not had a problem.

My experience is also backed up by Nasuni's Cloud Storage Benchmark from December that report that AWS has 1.4 outages a month (compared to Azure's 11.1 a month) and concluded that AWS was faster than Azure (AWS & Azure being the top performers)