Surgery approved! But now what to do?

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It has been a while since I have posted anything, and I appreciate all the help and encouragement I have received in the past on this forum. I received a call last Friday that United Healthcare has approved my ADR surgery for L5/S1. The doctor that I was seeing never mentioned anything about fusion so I started seeing someone at Texas Spine and Joint Hospital. Well he did, but it was very negative. I got to where I was willing to have a fusion done to hopefully have some relief. TS&J Hospital scheduled me to have a discogram on 1/21. Then they will tell me my next option. I told them how I was denied the ADR with the other surgeon, and they said fusion may be my only option left. Now since I have been approved for ADR surgery should I go back to that surgeon or stay with TS&J Hospital? I really felt comfortable and informed better with TS&J. Is it strange that the first surgeon never wanted to do a discogram?