I feel ways about stuff.
I politely disagree. The zipper ones are harder to manuever if you have to change the diaper after the baby is asleep--at least for us. Jasper usually goes to bed around 7, and we put his overnight on him after 8, and the way we have to yank his legs out with the zipper pajamas..boo! The snaps are easy access.
I wholeheartedly agree about the buttons vs. zippers. Zippers rule, buttons drool.