We aren't talking about the difference between 2133 and 4000Mhz in this situation. Just 1600Mhz > 2400Mhz.
He's not going for FPS increase, he's looking at increasing the rendering performance of video editing. Also, consider the platform. Z97. If he is running a 4th gen Devil's Canyon CPU, the performance gain going from 1600 > 2400Mhz will be minimal. This platform is also extremely finicky when you push the ram above 1600Mhz. He didn't tell us what CPU he has either. It might not be a "K".
Further, the BIOS for the 5th Gen Broadwell CPU's isn't well suited for 4th gen CPUs and OC. Again, don't know what BIOS rev he's running. Lots of issues reported with voltage, stepping and instability. Hence my recommendation of more RAM.
From a gaming perspective. I myself don't consider an increase of up to 9fps (under optimal conditions) is going to give me a perceivable increase in visual performance and game playability. Same as overclocking your CPU 500-600Mhz... the performance gains are less than 10%. Insignificant. All things considered, increasing the speed in one area isn't always "better".
In conclusion, I would rather have 16/32GB of 9-9-9-24 over 16/32GB 10-12-12-31 (your recommendation)
Cheers