GoPro or DJI - which one is better under water?

I have a Sony RX100 in a Nauticam RX100VII housing that I want to complement with a wide angle action cam for video shooting. Until now I used the Sony for video, too, but filming (in 4K!) drains its battery so fast that it sometimes didn't last till the end of the dive. Also, I would like to have a wider angle for filming, at least occasionally. I want to mount the action cam on top of the Nauticam housing so that I can take photos while shooting video.

Some time ago I read or saw something on the web saying that under water, the DJI is better than the GoPro. Unfortunately I don't remember why, or where I saw that. Therefore I want to ask here if anybody knows both systems and can make a recommendation. Or any tipps what to consider beyond the cam itself, like what kind of housings are available for each model (to use up to 60m deep), or which offers the better range of attachment lenses and filters.

Edited 6 minutes ago6 min by wus