I agree that it really depends on your needs. What works for a chunky monkey heavy wetter will likely be different than a skinny baby that doesn't pee much, etc. Also if you have hard water, baby has any skin sensitivities (i.e. wool, synthetic fibres, etc) it will make a difference. Personally I love my fitted + cover system, I have the Mother Ease fitteds which are durable and easy to care for (I got the newborn/XS size and then mostly the one-size fitteds). But I also like having some pocket diapers for quick changes on outings or when leaving DD with grandma.
I think it's a good idea to get one of a few different kinds to see what you like and what works best for your baby and then get more of that. Some things that I personally am not a fan of, but I know others love: prefolds (I don't care to have to fold them each time), hybrid systems (like Flip or Econobum, not good poop containment and my DD is a super-pooper!), AIOs (long drying time, can't add extra absorbency).