Cost analysis is really a hard thing to generalize. Diaper usage habits vary widely from person to person... but I do see your point. It depends on what matters most to the wearer... capacity or comfort.
When I was using the Secure X-plus only I would wear 2-3 of them a day. Using Attends only I wear 4-5 per day.
Comboing the two allows me to use just 3 diapers per day. Two Attends for at work... and one Secure when I get home.
The only reason I switched to the Attends is comfort. Don't get me wrong... Secures are really great... but I find that a thicker diaper is just too hot during the summer time... especially at work where I'm moving around a lot and there is no AC. The Attends are really comfortable... but I have to sacrifice some absorbancy to get the comfort.
Personally I don't mind that at all... as changing halfway through the day gives me a nice little chance to cool down and clean up for a few minutes (the bathrooms have AC) before I get back to work. Nothing beats the feeling of a fresh diaper on a hot afternoon... the wet ones get icky really fast.
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