My main thing for any large enough project is community. If it is a one off tool that is feature complete i'm not concerned. However, anything that is sizeable I just want to know I can find stuff on stack overflow or resources. Sometimes a solution is technologically better but with no community I prefer something inferior. I get this sense in VHS vs betamax or WCF vs restful/rpc http and now Kubernetes vs Service Fabric. Not that all of these are direct competitors but a giant community of free resources is hard to compete against a gaping void.
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