The best buff subclass for rouge

[haxial]

I wanna the best buff subclass for my char. I wanna something what will be good especially at pvp. So i wanna know +/- for each subclass. Becouse almost all skills at that is only for cleric rod/harf, so i wanna something useful what i will can use with crossbow alone, for pvp. If theres nothing like that, then at what subclass it is. Also i wanna know if bard is realy good for party or he is only for speed buff. thx for quick answers