The most important thing to me is to feel confident that the diaper is sufficient enough that even with a flooding, it will not leak. I want to have the feeling it has my back, so to speak.
As others have noted, circumstances play a role - i love the feeling of being ensconced in a thick cloth diaper and plastic panties, as i always get that feeling of security, but not practical to do so out of the house in public. Some good ABDL disposables, like Megamax don't give that same confidence from how they fit, but at same time, they perform so well that i trust them, but it is "different" to me.
Beyond that confidence, i love the look of a thick diaper on me. Could be cloth, or could be a heavy disposable, either way, that look of a well padded bottom is wonderful and feels great too.