The two big differences - the Voyareur has butted tubing, the Fuji does not. (I could be wrong about the S12-S. The earlier S10-S certainly did not have nice tubing. Strong; the frames went decades but never with a nice ride.) Also, the geometries are probably significantly different. I would ride both with that in mind. Better fit makes for a better bike and better ride. Better tubing is nice but better ride upstages nice. (My opinion - fit rules!)
Ben