If I have a deaf child, I would never implant my child, only offer the hearing aids if my child desire to hear.
But this is about what if I was a hearing parents that have a implanted deaf child, I would pick BOTH sign language and speaking. As far as the child raise, he/she will know which he/she prefer to speak through, maybe he/she prefer sign language or maybe speaking. I wouldn't force my implanted child to only speak, it will make the child feel that I don't give him/her any respect about his/her disability, for even more, the implanted deaf children are the MOST target being bullied by deaf children that don't have implants. I would prefer to have my child to able to talk and sign same time so that he/she can get along with both of the world.
Multi-languages speakers are always the better