I have literally used both hybrid work (weddings + YouTube). The Sony A7RV vs Sony A7SIII argument is reduced to the workflow. The A7RV takes fantastic stills and acceptable video (4K 60fps), whereas A7SIII has such options as 10-bit 4:2:2, uncropped 4K, and ridiculous stabilization, and the editing process becomes more convenient. In case the quality of video is a requirement, A7SIII is the undisputed winner. However, with work intensive on photography, A7RV wins.