For my 2c...I did AOW with PADI. I wanted to take a Rescue Course which I did through an SSI store...that qualified me for an SSI MD rating. Quite a nice card as it lists my specialties on it. I'm amazed personally that rescue/stress and rescue is not required for AOW, it would make for safer AOW divers.
Anyway, I'm doing DM now and I have to say I have learned next to nothing. Not to bash my instructors (who have for the most part been good), but what is there to learn that I need an instructor for? Oh I learned about the origins of deco theory, but I learned that more by reading the Encyclopedia of Rec Diving than from an instructor. Oh, I will learn to use the PADI (spare) wheel. So far I have done one pool session and got zero fulfillment from it. This struck me as strange as I am a karate instructor, sailing instructor and a personal trainer and although I got bored with teaching after a while I still enjoyed it. But there we go. Teaching diving is not for me at this point in my life.
So the upshot is...if you want to go to instructor you will need a DM or equivalent cert. If not, then it make no difference what you do. If you live in the middle of nowhere and the only way to get yourself diving is to be a DM then perhaps you should consider it, it will add an extra dimension to your diving and perhaps an enjoyable element. But no matter what, take a Rescue course, I am sure you will enjoy it, it was without doubt the best course I took.
Anyway, I'm doing DM now and I have to say I have learned next to nothing. Not to bash my instructors (who have for the most part been good), but what is there to learn that I need an instructor for? Oh I learned about the origins of deco theory, but I learned that more by reading the Encyclopedia of Rec Diving than from an instructor. Oh, I will learn to use the PADI (spare) wheel. So far I have done one pool session and got zero fulfillment from it. This struck me as strange as I am a karate instructor, sailing instructor and a personal trainer and although I got bored with teaching after a while I still enjoyed it. But there we go. Teaching diving is not for me at this point in my life.
So the upshot is...if you want to go to instructor you will need a DM or equivalent cert. If not, then it make no difference what you do. If you live in the middle of nowhere and the only way to get yourself diving is to be a DM then perhaps you should consider it, it will add an extra dimension to your diving and perhaps an enjoyable element. But no matter what, take a Rescue course, I am sure you will enjoy it, it was without doubt the best course I took.