The implant quotes are all different

I'm worried because the implant quotes vary so much from dentist to dentist. One of the molars is missing, but they say they even need a bone graft in one place, and the other can be planted right away. I went to implant dentistry and two local dentists, but the explanation was different, so I'm not sure which one to trust. When this happens, do you usually go to one more place?