Which open source VNC project did you settle on, and what made you stay?

There are several actively maintained open source VNC projects, and the choice usually comes down to
something specific and unglamorous: a platform you had to support, a protocol feature you needed, a
packaging decision that made deployment tolerable.

What did you pick, and what was the deciding factor? Equally useful: what did you try first and move
away from, and what pushed you off it?