Snap's V velcro is one of those ongoing debates, it is really what suits you best. And people will argue black and blue for each side.
I like a combo, i think aplix fits slightly better when DD is between snaps, but i am sure as DD gets older i will like snaps better! I do like like the snaps better in the wash.

Technically, if it needs stuffing, it is not an AIO. A true all in one goes straight from the line onto baby's bum with no steps in between.

Having said that Swaddlebees make a pocket all in one, the pocket is for extra boosting. But i would never use mine without extra boosting, so i guess it is an all in one, just not an absorbent one. Am i making any sense??