I have the GP 3, 4 black and Silver and not sure I would use 'smash' - they are good cameras but not superior by a long stretch. If you can control shutter, iso etc while the P3 camera is up in the air how can the GP4 be superior where you can't even fire the shutter let alone alter the settings ?
No I would definitely use the word smash. The p3 camera doesnt come close to the gopro hero 4 black. Neither of the cameras are really professional.
Your only comparing the p3 to the hero 4 black which doesnt make sense because as of this moment you cant even attach the hero 4 black to a p3. As for the OP's request. Hes thinking about getting the solo. With the solo you will be able to control all the settings on the gopro during midflight. I have a P3P and I have a GoPro Hero 4 Black. I'm thinking of buying the solo also for this same exact reason.
Which bring me to my next point and is off topic of OP.
GoPro Hero 4 Black has tons of different recording settings
P3P has
4k at 30 fps
1080 at 60 fps
GoPro has
4k at 30 fps
2.7k at 30/60 fps
1440 at 30/60/80 fps
1080 super view at 24/30/60/80 fps
1080 at 24/30/60/80/120
720 at 24/30/60/80/120/240 fps
and many more options
Shutter, iso, narrow angle, wide angle and medium
also has protune option which I always use.
Like I said GoPro Hero 4 black smashes the p3 camera.
I don't even want to start talking about the hero 5 and the capibilities that camera is expected to have like 8k at 30 fps and 3D options. Its coming out in October so DJI better step their game up soon
Also the GoPro admitted to producing drones and those are expected to release this year too. Between the P3Ps, 3dr solos, GoPros and the Lily coming out next Febuary its an exciting time for quads.