I've also had a PADI instructor who told me much more than was in the books for OWD and AOWD - so for my experiences it's like the PADI instructor is also possible to add...
My current "home dive base" is a SSI training center, but also offering CMAS and PADI. What i've seen here is: it doesn't matter, what organization you are certified by, but what are the contents during the education for the certification - and between SSI and PADI there may be only very small differences, if there are any differences at all!
I totally agree with sid101s last statement: for some people one organization may adapt better to them, for other people may be the other.
My opinion: PADI and SSI are almost equivalent.
My current "home dive base" is a SSI training center, but also offering CMAS and PADI. What i've seen here is: it doesn't matter, what organization you are certified by, but what are the contents during the education for the certification - and between SSI and PADI there may be only very small differences, if there are any differences at all!
I totally agree with sid101s last statement: for some people one organization may adapt better to them, for other people may be the other.
My opinion: PADI and SSI are almost equivalent.