You'd better always do levelquests as you can do at the highest level in Final Fantasy XIV. You can click the title to switch into an easier level, however, you will not go higher in hard if the level has started. You will gain HQ gear, same stuff level will drop in the low level dungeons, you can manage at high, the silver chests and blue are the only ones worth to struggle as they involve some great things. The dull ones are potions and there are some common useless items not worth you to do.
Note that when you wield your chocobo as a battling companion you will cost about 25 percent of your experience, try to use final fantasy xiv guide and balance your desire in order to level your choco with your demand for XP. The attack stance and HP buffs don't stack. You gain 1 point for per level reached up to 10.
The best method is to pick purely one of the three stances at this pint IMO in according to what counteract the weakness of your primary job or class, in fact, healing chocos and leveled tanking make the difference between failure and success in top level. If you die and get a healing choco, your party lack of healers, keep dead if nobody can save you. When you "HP" so your healing choco whose cures are now toward to the tank in final fantasy 14 gil online. You will see the tank will die, and the mob's health fully resets.