Hello and welcome
I think the snap in one ittis have different parts than can be 'snapped' in and out for washing and drying, while the all in one ittis are a one piece design with no bits to snap in or out. As far as I know you can still boost the all in ones.
So the snap in ones may be quicker to dry but you've no assembling to do with the all in ones.
I hope this info is right, I've only actually used the snap in ones.