To begin, good luck with your visit with your neuro. Hopefully, you will get positive news. In the event that a CIS or MS is in the bag, you're asking the right questions and I would encourage you to keep throwing them out there.
As far as the ABCs, I think you're going to find a variety of opinions, because there really isn't one clear cut winner of the bunch. What I can do is tell you the thought process I went through in 2004 (which is when all of this stuff hit me). This is by no means the only answer and I would encourage you to continue asking others as well, but this is how I came to my decision.
I ended up seeing 3 diff neuros at the beginning (this was due to a diagnostic discrepancy between the first neuro and the second opinion). All 3 neuros specialized with MS, were well published, and were considered the biggest names in MS where I live. All 3 suggested different meds. One suggested Copaxone, another Rebif, and a third Betaseron. As you might expect, it left my head spinning (on top of the already present vertigo:)
I did my own research and that helped somewhat, but not enough to clearly delineate one med over another. The end points of some studies looked at MRIs whereas others focused more on relapse. It wasn't always apples-to-apples.
I ended up choosing Copaxone. I did this for a few reasons. From my understanding, the side-effect profile for Copaxone was less problematic then the Interferons. For example, one of the possible side-effects of the Interferons include a risk for depression. I am someone who has had to deal with that at times and I didn't want to increase the risk of it. The Interferons can also effect one's liver. At this point, my MS (or CIS) is pretty mild and I didn't want to put it at risk, unless I had to.
One of the main drawbacks of the Copaxone is that you have to give yourself daily shots. At first, that sounded awful. But, I've gotten used to it. At this point, the shots don't even bother me.
I can't emphasize enough that I am not promoting one med over another, this was just how I came to my decision. In fact, for the first year or so, I wavered on changing. And, I still might in the future. But, I've been fairly satisfied with the Copaxone up until now.
I hope this helps. If I can be of any further assistance, please let me know.