I'm not sure there is anything about AC current or voltage that is more easily measured than DC. Neither am I persuated AC is any cheaper to produce (ie. generate froim mechanical energy). (Unloaded DC generators do have their problems though.)
However the lower line losses are certainly a siugnificant advantage to AC and it is far easier to rectify AC signals to produce DC at high powrer levels than it is to procuce AC power from DC, If that is what you mean by greater variety, then I agree.