Hmm, not sure if I have a favorite per se. If I had to choose one to know probably Go, even though I am not super proficient in it yet. Go has high enough performance and enough flexibility to do pretty much anything web related (and a lot of other stuff).
For OOP I like PHP as it offers a ton of flexibility and (optional) strict typing. Learning some Python recently I have found more respect for PHP's implementation of classes/interfaces/traits/strict types.
For API's and event driven logic I like JS (node) due to its easy to use async nature and performance. For browser there is not a choice really so you can't really call browser JS your favorite I think.
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