I am very surprised that you compare two different framerates... On the other hand, i am not suprised at all that the lower-framerate camera offers more quality, as your findings are pretty much lower quality because of higher compression (which is what you usually find when shooting higher fps in almost any camera: same datarate per second = less data per frame at higher fps). I would strongly suggest to make a review with the same settings. This review is rather pointless and misleading!
GoPro Hero 4 Silver vs Black - Hypoxic Comparison
in Gear
On the other hand, i am not suprised at all that the lower-framerate camera offers more quality, as your findings are pretty much lower quality because of higher compression (which is what you usually find when shooting higher fps in almost any camera: same datarate per second = less data per frame at higher fps).
I would strongly suggest to make a review with the same settings. This review is rather pointless and misleading!