Hi @Jarvis1310, I’ve moved your post to its own thread because it was unrelated to the original topic.
None of those are requirements for running a T200 Thruster.
You need an ESC that is capable of running a brushless DC motor, and it must be capable of supplying power within the 7-20 V range the thruster is specified to.
Bidirectional output support is necessary if you want to be able to drive the thruster both forwards and backwards (which is usually the case, but not for all applications).
The input protocol(s) supported by your ESC are only relevant to how you want to send commands to it. PWM is one-directional communication, and is reliant on analog timing of electrical pulses, but there are many different sources that can provide a servo-style PWM signal, so it’s a good versatile option if you don’t need extremely precise motor control.
If you have full control over what hardware you use to send signals to your ESCs then you have several alternative options, with different tradeoffs that may or may not be important to you.
Underwater thrusters often spin a fair amount slower than the motors used for aerial propellers (for drones and planes and the like), so you may need to configure your ESC to run well for low kV motors.
That requires some non-negligible startup power, and in the case of the Basic ESC we also:
as well as having “Brake on Stop” turned off, since water tends to slow the propellers down quite quickly anyway, and (as I understand it), it’s preferable to avoid spikes of back-EMF from trying to brake faster.