Im in a similar position to you TUP! I wanna go cloth but am still sorta researching

Here's what I've found so far!

Pockets - they literally have a pocket to put in the absorbent materials, this simply makes for quicker dry times (and handy if they've just weed and you don't have another nappy! You can shove anything absorbent if you're in a bind!)

Fitted - they are similar to an SIO, but you need a cover as they aren't waterproof, they are apparently best for newborns til they start solids as the poo can be more explosive ()