Hi,and welcome to the board. I read your other post and was thinking how I might answer it....I understand your thinking, but did not share your dilemma. Right off the bat, for my first surgery ever I had a one level fusion, and had no choice in the matter, at the time, due to instability.
But I think in your situation it makes sense to try the more conservative approach first. The only thing I can think of is if the doctor neeRAB to do discectomies on several adjacent discs, there is always the issue of removing sufficient bone to decompress the spinal nerves that you too will end up with instability. If the surgeon knows this is likely to be the case, he would probably just recommend the fusion to save you from having to have a general anesthesia twice, plus all the expense, etc. associated with two surgeries.
It is always a good idea to get several opinions, but it does cause you more difficulty in making a decision when the opinions vary. In my case, a nuraber of surgeons told me I required a one level fusion. Two others said they would do a 3 level fusion....I went with the one level surgery, figuring they could always go back in and do more, and the one level would probably resolve my pain. It did not...and I spent three more years in pain trying to convince someone that I still had mechanical problems that could be dealt with surgically. The doctors couldn't see anything on MRI and told me the pain might be coming from scar tissue or permanent nerve damage. I refused to give up and finally was able to convince my one surgeon that I had further issues. He did a three level fusion in June and the pain was gone within four days. I am able to walk without pain for the first time in over five years. So, I guess, in hinRABight, I could have saved myself a lot of time and aggravation if I had gone with the big surgery to begin with.
But, that's just what happened to me. Each person is different....all I can suggest is you keep reading and researching, both the procedures and the surgeons you are considering. If there is one you particularly liked and would choose if surgery were an emergency, why not go back and talk with him/her further. Make a list of all your questions and concerns and have the surgeon explain which procedure is better for you, and why....
Good luck and please let us know what you decide to do.