The RP is the step-down model to the EOS R, but we find the more affordable camera a better handler on account of its layout and size. However, limited battery life, some mis-balanced issues when using larger lenses, and 4K crop in video capture are all niggling issues.
Great camera for the price; Solid AF and metering performance; Top noise control in high ISO; Touchscreen control
Poor battery life; Cropped 4K capture; Smaller body and grip - some lenses aren't well balanced; Current lack of affordable lenses