I have both controllers. I got the RC when I purchased my
Mavic 3 Pro and decided to keep it as a backup for my RC Pro. That being said I have tried the RC out to see how it compares to my RC Pro. I too shoot mostly photos with the occasional video.
I love my RC Pro - the screen is bright even in strong sunlight and it has an auto-adjusting brightness which is very useful. The screen is a higher resolution than the basic RC so you can see more of the dynamic range from the camera. It is fast and responsive and has a quality built feel to it. The additional buttons and the 5D button make customizing the controller to your liking convenient and ultimately make the flight experience much easier. Although I don't fly beyond VLOS the external antennas give more signal stability. The ability to load third party software is also a plus. I have Dronelink, Litchi Pilot (beta), and AirData on my controller. You also have the ability to attach an external display to the controller through the Mini HDMI port to have a second monitor to mirror the built in screen or just display the camera feed. I haven't done this but am considering it. Finally, the RC Pro really was built for the
Mavic 3 line and the controller allows you to really take advantage of the
Mavic 3 Pro.
The DJI RC is also a nice controller but it is a basic bare bones controller. It provides the convenience of not having to use your phone to control your drone and does have separate camera and video buttons and C1/C2 buttons. The screen is 700nits whereas the RC Pro is 1000nits and does not auto-adjust brightness to the conditions. Using both controllers, I personally find a huge difference in the brightness in bright sunlight even with one of those flip up screen shades installed. Also, I found a huge difference in the dynamic range that the screen could display due to the resolution of the screen. It's much easier to view details on the RC Pro. What I do like about the RC is that it lighter than the RC Pro and the battery lasts longer.
If I was purchasing today, I would still purchase the RC Pro over the RC for my
Mavic 3 Pro. You do get what you pay for and often the features and feel of the RC Pro are hard to describe. It makes the flying experience so, so much better. If I didn't have my
Mavic 3 Pro and just had my
Mini 3 Pro, then I likely would not buy the RC Pro as it would be overkill for that drone. Instead I would get the RC-N1 so that I could use third party apps with it.
Hope this helps.
Chris