"I do a lot of sport fishing d
"I do a lot of sport fishing down in South FLorida and generally we like to see a one piece door that opens in. You can latch it, or someone can lean against it to control the door.
The two piece types that have the top fold open and the door swing eventually meet with problems along the hinges at the base of the top folding piece. Plus, why have two moving pieces and sets of hinges when you can only have one? If you use a heavy duty latch you won't have to worry about the door popping open if a wave hits your transom. Someone said it best here already, if a door is going to "pop" open, why not have it open in and allow some water in the cockpit rather than opening out and risk loosing the most important thing of all (a passenger or child).
Furthermore, an outward opening door requires a "catch" on the transom so that the door doesn't swing around while open. Imagine a hand in the wrong place and all the sudden the door comes swinging shut and WHAMO! broken hands fingers.... This catch will always be in the way on the swim platform, and can be pretty dangerous. I have seen a small white Marlin impale itself on a transom door latch in Cabo San Lucas. If a fish can do that, I don't want the same danger should a guest or family member slip on my swim platform.
It's just my opinion, but I would recommend a one piece inward swinging door."