by contoured nappies ...do you mean fitted nappies???

depends entirely to you.

i personally liked prefolds as they washed up quick, dried quick and I could have 24 of them in rotation without taking up a bucket load of space. As for covers you dont need to change them every change unless of course they are soiled. I preferred fleece and minkee covers as they allowed circulation to the important area

I had some fitted AIO's in my nappy bag for out and about for convenience.

I also preferred prefolds because you just cant pick the body shape and fit of the perfect nappy with a NB. Their all so scrunched up ect you dont know if their going to be long in the rise, wide in the hips, a side snapper setting or front snapping. Using the prefolds for the first 3 months allowed me to wait until my little bub's body stretch out enough for me to buy what was right for him

God I hope that made scense