When my daughter was little Huggies worked but not Pampers. Then as she got older, we tried Pampers and found that they work better.
I find she stays drier longer in a Pampers than she does Huggies. On the box it says 12hrs (I don't let her go that long of course, but she doesn't wake up from her nap sopping wet anymore either)
It really just depends on your child, his weight etc.