I find bow scout more fun than xbow scout, but xbow scout is just better in every way because a critical class is only good when you are on the top of the critical rating rank, but sadly it isn't the case for bow weapon, they are just little above average. So you can't do any significant damage to anyone that has higher critical rating than your bow, the only way is to have pierce defense which belongs to xbow. And xbow can go for dodge build, but bow cannot, because xbow has a good accuracy down shield skill, and they have an AP passive that depends on DEX, they are definitely good if they go for high DEX build. However, bow just simply can't do that because they don't have acc down skill, flash trap is just too unreliable, so they are pretty much forced to go for critical build otherwise they will lose a huge portion of damage output.