I am FMS Certified and have a CES. I can’t speak for TBMM, sorry.
As for the other two, CES is pretty easy to apply to most clients in real world aspect. The OPT Model in the CES is based on which stage of correctional exercise your client is in. You go from inhibiting over active muscles and all the way from incorporating dynamic movements after one demonstrates they can control more basic movements without huge compensations.
I think FMS is very generic an can’t necessarily tell you where imbalances are as far as length tension relationships are concerned. It’s more for telling if one can “return to play”. You take a subject through a series of movements and rate them from 0-3 based on your own interpretations of normal joint/muscle range of motions or if the person has pain. That, in my opinion leaves too much to personal interpretation. It really tells me if a person is safe to participate in higher level power exercises and strength conditioning ( or sports). In my day-to-day work life, I don’t have very many clients that are looking for that or need that. I personally only use the push up clearance test and shoulder mobility tests, to assess new clients from FMS. That said, there’s plank testing and shoulders tests that are more in depth in the CES. 🙂
I use what I’ve learned with the CES every single day in my business and I’m one of the top trainers in my city. Definitely worth it for me! 🙂