Imo it all comes down to equipment and player skill, if u got the gear and no skill you are bound to loose to a better player with lesser equipment, or vice versa also still depending on gear so i say that gear weighs in at 55% and player skill at 45% while skill is a heavier factor if equipment setups are similar, so therefore there is no best class but only the build and the player determines the winner and slow doesnt hurt a barb if u kno how to get to a zon in time or u got tele charges