I honestly didn't know there was a small ball myth. I think everyone knows that bigger is better.
However, there is one major issue, which has led to more smallball...and that is a dearth of talented big men. And when it comes down to it, talent trumps size.
So, it goes like this:
Great big man is better than a great little man.
However, a GOOD big man, is not better than a great little man.
But then you have the entire team angle. If you have good players at every position, including good big men, then you may beat a team with a great little man, but bad big men.
And as always, none of this is as simple as we make it out to be. There are so many levels. You need to take into account styles, and chemistry, and all of that.
But where "small ball" comes from is when teams that are not lucky enough to have great big men decide that they would still like to win games. So, they try to make up for their lack of a great big man, but getting as much talent on the floor with smaller guys as possible. And, sometimes, that can work.