Well, if you want to work for a college in the future, you might want to have experienced their education and in particular, their train the trainer education. Maybe contact lecturers working there and ask them where/how they trained. If they didn’t train at the college that they worked for, ask them where they trained and whether they’d recommend that training.
If there is a particular business or brand that that you want to work for or with, why don’t you reach out -to the company or individual trainers - and ask them if they recommend any particular train the trainer education course provider.
Ot if you plan on having your own training school, maybe connect to other trainers for schools that you admire, and ask them for recommendations.
in my experience people like to be asked for advice.