I've just done a 2 week trial and from it gone for the bum genius all in ones. My lo is 6.5 months so rather used to disposables and the ease of putting them on. dh especially couldn't face a 2 part system.
Do consider if you are going back to work whether your nursery or child minder is prepred to use re-usables. Mine is but I'll be the first to ever use them at nursery so again went for all in ones as far more similar to disposables and they shouldn't put them on wrong to cause un-necessary leaks.