Bluetooth works well for portable, individual use across locations, and it pairs smoothly when a mobile is a regular work device. DECT is better when range and stability matter inside a larger workplace, such as when walking to a breakout room while staying connected. DECT gives greater range, yet Bluetooth gives more ubiquity and cross platform connectivity. For smaller spaces, like working near a single desk, Bluetooth is usually perfect. However best choice comes down to the distances you need to cover and obstacles such as walls or stock shelves etc