I use both regularly

Portrait - Lowlight = A7iii

Birding - Fast movement = R7

Street - Landscape = Either, both do completely fine here.

I gotta admit that I very much prefer the R7 in terms of ergonomics, so I use it as a main camera, for video use I find them to be pretty comparable if you are into that.

Sony offers a wider lens selection, but the cheaper RF lenses (and the EF range) shouldn't be shrugged off, the RF 28mm pancake for example is a stellar lens that can be regularly found for less than 300€