We've been using Canon for a long time and one of the main reasons we still use them. Once you drop a ton of money into a one brand, it's hard to move to another, especially when you have double the gear being a duo. We freaking love our Canon gear and it works for us.
The colors, the overall quality, the lens options, their CPS membership and the incredible low light ability on the Mark IV all keep us pretty dang happy. We've been shooting with the Mark IV's for nearly four years and the Mark III's for close to seven years.
If you are looking for a workhorse that is reliable, resiliant and has all the benefits of a professional camera line, you cannot go wrong with Canon. We'll likely be staying with them with the release of the Canon EOS R5.