I have both the Bandera and the WSM.

The pro's about the WSM: It's like the Ronco Showtime Rotisserie;
basically you just set it and forget it. It's very forgiving. If you
use good basic BBQ technique, it'll put out a great product.

The cons: It's kind of small and manipulating large amounts of meat
is cumbersome. You have to take the meat off the top rack, find a
place to put it while you mess around with the stuff on the lower
lever.

But, if all you need to do is a few chickens, a turkey or two, a
couple of slabs of ribs, or other small amounts of product, it will do
fine. Mine gets used more often than my Bandera.

My bandera on the other hand is useful for large amounts of products.
Need to do 6 racks of spareribs? No problem. Four 20 lbs. turkeys,
again no problem.

The bandera will use much more wood or charcoal than the WSM. And you
can use the Bandera as a grill if you're so inclined.The offset fire
box is easier to work with once the smoking has begun.

Besides, when people see the WSM, they all say, "I got one of those
smokers (usually the Mecco or Brinkmann which look a lot alike). But
when they see the Bandera, they usually say something like "Damn! I
gotta get me one of those"