Both have their merits, and you can’t simply say one is better than the other. You will have your own preference, and the type of sensor you need depends on what you want and need. Cadence sensors, like the one found on the CMB700 can be perfect for (more elderly) riders who have joint problems and cannot use much pressure while pedaling. Torque sensors are great for anyone wanting an authentic biking experience and still wants the full benefits of exercising.
To choose the one your need, it’s best to try both and tune in to how your feel about the ride.