All good points above. For me, I've found the best balance between comfort, discretion, and sheer absorbency to be ABU's PeekABU. If I put one on, I know that I'll be good to go for the rest of the day, if not the entire night as well, without leaks.
Also, if you want extra security against leaks no matter what diaper you're using, maybe look into some quiet, comfortable, and close-fitting plastic pants. They can quiet down noisy disposables and, as long as they fit tightly around your legs, will hold back the tide of leaks in a very impressive manner.