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What I would find more important than a comparison of technical features is a comparison of their active communities.

How many people are using each project, how active is development, that sort of thing.

At good metric for an indirect peg on number of people using something is the "star" count on Github. It's not an ideal metric but it is a reasonable proxy. The other thing I'd look at which requires more effort is to look at the number of subscribers to the mailing list (if you can get it.)

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