that roll forward when they sit up. to me, the one row of snaps seems to be more comfortable for baby because of it's small 1/4 inch snap height, thus it digs into baby's belly less. the baby fat rolls around the snaps easily. also, i never get a scratch from snaps. but, overall the fit with h/l is usually nicer and looks nicer. the front of the h/l cover lays better. the corners of fabric near snaps can pull back a bit and not lay as flat as the h/l kind, thus appearing less neat. but i still prefer snaps for my baby's comfort. another factor in the choice 