I sold all my Canon gear a few years ago because I am too old to want to carry around several heavy lenses, so my main camera now is a Sony RX10III with a zoom lens that offers the 35mm equivalent of 24mm to 600 mm with beautiful results, even though the sensor is smaller than the one on my old Canon 5DII.
So if I still had Canon lenses, I would definitely go for better dynamic range over pixels, so for me it would be the 5DIV.