The TrailerSaver line is quality and so is B&W. So in that they are no different. The difference is TS have air bags and B&W does not. Many ways to skin a cat. I tow MUCH heavier than most anyone here with a solid B&W and a TrailAir pin box. Setup does the same but at MUCH less $$$. I look in my rear view and watch the RV move up and down separately. I have Factory Rear Air on my Truck and that makes a huge difference also.
I also have the Trailair air pinbox and used it with my solid Reese hitch before switching over to the trailerSaver hitch and in my opinion there is a difference