The Dr that take the lead in treatment for any cancer really depends on the condition of the specific patient and not on the type of cancer. Oncologists are often the lead Drs for patients with advanced stage cancers that are treated primarily with chemotherapy, while early stage cancers may be treated with Urologists or surgeons in the lead if chemo is not indicated or necessary.
If you are getting what appears to be conflicting information from Drs then you need to request that the Drs talk to one another and then explain their positions clearly and concisely to you in a manner that you can understand. If they refuse to do this it may be time to seek other opinions. You should be the one making the final decisions about your treatment so they need to be able to explain the options and the risks and rewards associated with each option. Good Luck!!