Once I started playing around in Pownce, I realized that while Pownce was more visually appealing to me, Twitter just brought the goods. The simplicity of the solution, and the fact that I had already made the investment of adding a bunch of my core “friends” in, was enough to convince me that Twitter was in fact better for me.
In the end, it’s really about usefulness and time not wasted. Twitter got there first, and kept it simple. Therefore, they win.