I've been trying to decide between the Trickster path and the Champion path. My Slayer has been granted vanish as a spell like ability, so I am interested in getting those sneak attack dice in. In your opinion is Champion or Trickster better and why?
Well, Trickster has Aim For The Eye (Mythic Origins), which sounds EXCELLENT for a sniper build, and Path Dabbling (later on) can get you pretty much anything you want from another route.
I actually prefer Champion in general, but for your specific build, Trickster is probably the better option.