I probably won't develop/code (others will do)so don't mind about learning things. I thought will be the best choice GOlang instead of NodeJS cause it's native and have better support than NodeJS for "multithreading".Am i wrong?

as OS i think the best choice would be CentOS 6/7 Ubuntu i don't think is good as server,cause it's usually full of st and the "random" broken apt-get it's a pain in the a. Arch it's too bleding-edge. *BSD i don't know nothing about. Windows...no.