Depends on what you're fighting, I think. In the old days, and probably still in low-mid level parties, the trend was to fight IT++ monsters for maximum EXP per kill, and hope for chain 5 at most. In these parties, you'll need accuracy all the way. Smart parties know that indefinite 5+ chains of Ts and VTs is better EXP in the long run. You don't need as much accuracy for these parties. I know these parties (TP-Burn style) are all the rage once a player can EXP in ToAU regions, and if past precedents are any indication, I imagine this mentality will or already has permeated down to low levels. So anyway, you might be better off carrying an attack build and an accuracy build. You never know what mobs your party will be targeting these days. In the old days you knew every party would invariably fight IT++ with a skillchain and magicburst. This is no longer written in stone.