Personal trainer course In person vs Online?

G'day everyone,
I am planning to do Cert 3& 4 in personal training and planning to work (mainly as a side hustle). I am checking out prices to do the course and they vary from $1200 to almost $10k. I would be very grateful if anyone can please share their experience or thoughts on doing the course online vs in person and possibly recommend a good place as well (Sydney Australia).
Cheers