Choosing between a jacket BCD and a back inflate BCD isn't about finding the "best" option—it's about matching your gear to the diving you actually do. In this episode, Ray Hollister draws on four decades of fitting hundreds of divers into both styles to break down the real-world performance differences between these two designs. Whether you're a beginner prioritizing surface comfort or an experienced diver chasing perfect underwater trim, this episode cuts through the marketing to help you make the right choice.

• Jacket BCDs dominate at the surface because their wraparound bladder keeps you vertical and stable without effort, while back inflate designs push you face-forward and require constant finning to stay upright—a critical factor when most of your BCD time is spent waiting on the surface.

• Underwater, the ad ...