If you decided to become a recreational diving instructor which agency you would opt to do it through? Perhaps present PADI instructors or BSAC instructors for example would choose an other agency if they were to choose their agency again to become pros? What are the benefits and disadvantages of your agency over others? Would it depend where you teach? Would you choose one agency in the UK but another in Asia the Americas or Egypt for example?
As a Padi and SSI instructor, if I were starting again, I'd go to SSI. My lockdown experience has only re-enforced that. The sylabus isn't that different to Padi's so you could always swap over should you need to but SSI are growing very rapidly, so they're pretty wide-spread now anyway. If you want more details, I can PM but it's too much waffle for a thread.
The views expressed are my own, worth what you've paid for them, are not on behalf of anyone else and not those of any company I work for etc.