Joby BallHead 5K Mount

I literally own THREE of these. This is hands down my favorite ball head I've used, and pretty much every tripod or mounting setup I use with my nicer cameras ends up with one of these on it.
 
I originally bought one and liked it so much that I kept buying more because I got tired of constantly moving the same ball head between my different tripods and camera setups.
 
One of the biggest reasons I love this particular ball head is how securely it locks into position. I've used so many other ball heads where you tighten everything down and the camera still slowly droops or the ball slips—especially once you put a heavier camera and lens on it. I don't have that problem with these. I can position my camera exactly where I want it, lock the ball down, and it actually STAYS there, even with my heavier camera setups.
 
The quick-release setup is also a huge part of why I like it. I'm constantly moving cameras around while I'm filming, so being able to quickly get a camera on and off a tripod or switch between setups saves me a ton of time.
 
There are cheaper ball heads out there, but this is one of those pieces of camera gear where I genuinely think spending the extra money is worth it. I've tried other ball heads, I own three of these, and I keep putting them on basically everything. If you see one of my cameras sitting on a tripod or another mounting setup, there's a very good chance this is the ball head underneath it.