From humble beginnings at an MSP, I've adventured through life as a sysadmin, into an engineer, and finally landed as a developer focused on fixing problems with automation.
You should pick a language based on needs. If your team only knows .NET, you're going to be using C# (and likely mssql). If you want everything to be a single language, you're picking NodeJS. etc. We (web devs) don't get into cases of performance very often anymore unless you're in Alexa top 500 or something.
RE: Ruby. I don't know where the use/recommendation of this lang/framework come from, but I have never seen a job for it.
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You should pick a language based on needs. If your team only knows .NET, you're going to be using C# (and likely mssql). If you want everything to be a single language, you're picking NodeJS. etc. We (web devs) don't get into cases of performance very often anymore unless you're in Alexa top 500 or something.
RE: Ruby. I don't know where the use/recommendation of this lang/framework come from, but I have never seen a job for it.