Red Mage and Dancer are the best ones since they have access to a couple of AoE skills at such a low level and already have most of their kit already, while Bard and Machinist has one AoE at lower levels so they're kinda good. I disagree with SMN because it's pretty weak below level 58 or 60 and doesn't really feel "complete" until you reach that level, and it's still weaker than a BLM.