How do s3cmd and Tim Kay's aws script compare to one another, feature-wise?

How do s3cmd and Tim Kay's aws script compare to one another, in terms of:

1. Feature richness ?
2. Ease of use and maintenance ?

Please tell me if this belongs to 开发者_开发问答serverfault or somewhere else.

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Please also consider PowerShell command line interface which comes with CloduBerry Explorer freeware . This is windows only though

http://cloudberrylab.com/default.aspx?page=amazon-s3-powershell