Again; this is my own opinion and I am not on a competitive dev team. AWS is the defacto standard; and I think learning the API keeps you out of the UI.

Azure has one too; they are both clunky and more than I need but; and someone who uses AWS hopefully will chime in-- my guess is most people use the API almost exclusively. I don't have enough familiarity to judge it; have only use it a bit and a while ago