I've switched from PADI to ANDI.
ANDI is particularly good for Open Water certification. ANDI promotes self-reliance above buddy-dependence. They are the only agency that includes training with a true pony bottle (not a spare-air), even in their OW course.
Think about it... You run out of air at depth. Your buddy is too far away to get to and is not paying attention to you. Even if he's right there next to you, he's got to be low on air if you're out. You grab his secondary and are now both breathing (heavily) off of one low tank. I do not like this scenario. Of course if he's not right next to you, this scenario gets worse!
Better... You run out of air at depth. You switch to your pony. Now, you find your buddy, get his attention and call the dive. Much better.
Of course after the out-of-air problem, you pay more attention to your gauges!
Thom Dutton at Deep Blue Scuba is Austin's only ANDI training facility. And Thom is a good, knowledgeable, patient instructor.
Deep Blue Scuba
His shop is on 183 near Oak Knoll
my 2 cents worth...