Mesaboy2's thread is awesome, but this is one thing I disagree with. I'm no Disney expert, but almost whenever I look at my app showing the lines, the Epcot Character Spot is almost always a longer wait than the other ones mesaboy2 has rated as a B. It seems to almost always have a wait of 30 minutes throughout the day, whereas Maelstrom for example has almost no lines when it first opens around 11, spaceship earth has short waits closer to the evening, and mission space is kind of random, but usually has a shorter wait.
With that said, I'm basing it all on reported times by the app.