How about the agency with the instructor you like the best in your locality. Interview, Interview, Interview. Not to mention completely agency neutral. Its in the instructor not the agency.
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I am a long, long way from being an expert, but here is my two PSI.
GOOD STUFF SNIPPED...
Everyone tells you, the main importance is choosing an instructor and not an agency. I didn't find that helpful because there were no tec instructors where I came from, so it was a leap of faith. Eventually I went with TDI and have no regrets.
A brief but good summary! Thanks for taking the trouble to put that together.
And very happy to hear that you have no regrets progressing through our curriculum.
For the record: I have sent the OP some contacts for TDI in Australia and the UK at his request.