I've been a long time user of Goodnites Girls, I've gone through many packages in the past 2.5 years. I also tried Tranquility ATN's on one occasion, and they were my favorite in terms of fit. And now I am unfortunately growing out of the Goodnites and they can no longer hold enough.
My requirements are that they are plastic backed. I liked the tranquiltys for that reason and that they had a tight fit that constantly reminded me that I was wearing a diaper when I woke up in them. I don't care if they're pull ups or diapers, as long as they're plastic backed and feel like bulky diapers and don't leak.