I most likely would also get Canon (R5) again, and for the same reasons, but the competition nowadays is so close that after getting used to the ergonomics, I'd probably be just as happy with a Nikon Z7ii or Sony a1.Honestly, if that happened to me I’d buy Canon again. I might not replace all my gear, but most of it. Partly that’s because my current system meets my current needs very well, but another big part is that I know how everything works, from menus to muscle memory it’s all seamless.
I've got used to the nice images from hi-res full frame, so I'd have to think harder about whether to go the Fujifilm XH2S route.
And while I probably wouldn't consider OM Systems OM-1 for my main camera, if I could afford to run two systems, it's something I'd definitely look into.