In my opinion, diapers with landing zones are usually the ones that have a poor fit around the legs. It seems no matter what I try ABU, Tykables, Rearz, and ect... they never provide the best fit. I find that when I wear Crinklz, I usually put the bottom tapes on too tight and had to learn to give some slack so my legs didn't get badly chafed. Current Crinklz does not have a landing zone and I usually get the best fit.
Another reason is that you could fall in between sizes. Too large, and you don't really get a good fit around the legs. Too small, the tapes hardly make it to the landing zone and the diaper doesn't come up high enough and you have leaks out the top (for guys).
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