It depends a lot on your group setup and what content you will be raiding:

Are you the Only Melee?
Is there a BRD or MCH in your group?
Are you looking for raid utility or personal number gain?

If you are the only Melee, you may want to go Monk for the personal DPS gain

If there is a BRD or MCH in your group, you may want to go Dragoon to apply the Piercing debuff to assist in their damage

If you are looking for a bit of raid utility, you may want to go Dragoon for the Battle Litany buff for that extra crit rate and crit damage.