in all honesty, a camera system depends on which glass you have or intend to get. everything comes down to the glass in the end. Any top camera body will perform with quality glass.
I use the Nikon system because I am invested in Nikon glass, expensive nikon glass. I know little about Sony or Panasonic.
the difference between canon and nikon are few. nikon supposedly a bit better flash and focus, canon a bit better high end glass more adaptable to dslr video maybe.
one other aspect of nikon is that nikon bodies are designed to be ergonomic by like the guy that designs what the fuck ever, right?
https://www.bhphotovideo.com/explora...esign-heritage
the canon bodies feel obtuse and awkward in my hands.