I'm going to simplify and restate my position on MC vs. SW&D. To really be great at either is difficult. However, you can get to a level of competency in MC much easier that you can in SW&D, and competent instruction is much easier to find. "SW&D" is much broader, more difficult to "get" conceptually, and competent instruction is much harder to find.
I'm more of a sports guy than and a music guy, so I'm going to use a different analogy than did Derek.
There are tons of good boxing gyms, in every mid-sized city, and if you train hard for six months at those gyms, you are going to start to learn the fundamentals reasonably well. You will be able to jab, throw a cross, and uppercut, and know defensive fundamentals. You will also know where you have the most need of improvement.
MMA gyms also abound, but many, many, of them just suck all around. Some are good at a specific aspects, but bad at others. Really great training facilities are few and far in between. Also, because of the popularity, they are oversubscribed, and a lot of people are essentially tricked into thinking that they've learned something. Becoming competent in wrestling, kickboxing, boxing, and jiujitsu, not to mention the all important transitions, at the same time, is incredibly difficult. I've watched a lot of amateur competitions in both, and I'll tell you that the worst fights were definitely in MMA. You often wonder "did this dude actually train at all, or did he just see it on tv?" I've trained, trained people, and fought some decent competition, and I'll admit, with no caveats, that my wrestling is definitely subpar - I'd say, barely passable. Even a the top level pro ranks, you see gaping holes to fighter's overall games.
SW&D is like MMA. MC is like boxing. You have to be naturally talented to be great at either, but it's easier to reach a decent level of competency at one than at the other.