soldier is better for defending(when challenged on a duel cause 50% bonus on tactics) and dueler is better for challenging other players cause there motivation for duels.
soldiers are better melee soldiers you should put all points in strength and skill..well depends do you want to be aggressive or defensive dueler.defensive-tactics offensive-dodging.you should put some points in aim so you can hit some1 in a duel and reflex for resistance on firearm(toughness is resistance to melee weapons but you get 1point every level when you put in strength )
dueler-all attribute points in dexterity
skill points-aim,shooting,dodging,reflex,toughness
duelers motivation for dueling raises 20% faster,they recieve 10% more money in a duel and they have bonus on speed 10%
soldiers get 50% on tactics(only when challenged on a duel),5 health points for every skill point in health and minimum level required to carry a weapon is reduced by 3
they are almost same but soldier is stronger if you don`t wanna duel all day cause they have some good jobs they can do unlike duelers
hope this helps