They are different in the sense that their teaching method are slightly different but both basically try to achieve the same thing - teach you to dive safely. As to which is better there are literally 1000's of posts in different forums arguing the advantages of one over the other - and even if you read them all you would'nt find a definite answer. I personally think it's more important how competent your instructor is than what organization he belongs to.
PADI has one advantage that it is by far the biggest certification agency which usually makes it affordable and easy (do the theory and pool stuff at home and then get final certification on your first diving holiday). So for recreational diving PADI seems to be a very popular choice - and after the first couple of certification it is also a lot easier to decide what you want from diving and what agency is more suitable for you.

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But it was just an 'equipment malfunction', not because he had his head up his ass and stayed down too long, ran out of air, and had to make an emergency ascent 
