Meh, neither class brings too much to the table up to level 49, they're practically both just DD's until then as the BD's only useful skill is dance of fire (I suppose you can make an argument for dance of light for certain exp spots, and even then for a mage party is just as useless as a SwS. The SWS gets warding and wind, Neither class brings much to a party for PVE at this point, the BD party is going to down mobs a little quicker with dance of fire fire and the sws party is going to take less damage from magical attacks/have some more movement speed. Either way, both aren't going to make a huge amount of difference to a parties overall exp/hour. (depending on the size of the party/hunting area, as you get higher levels it gets better but at that point they also get more songs/dances) You could argue it's more efficient to take another DD rather than getting a BD/SWS sub level 50 but if people are going to try and be that efficient outside of CP's then they are insane. All in all I don't think BD's/SwS's will have a problem getting a party, because everyone wants to make friends with those classes you're going to need later on.