To be honest with you, I completely prefer air conditioning to any type of fan at any given moment.
Air conditioners are better tools or appliances for conditioning the air around you. I mean, a fan is no where close to achieving what an airconditioner does. The entire operations of a fan revolves around taking the air in circulation then blowing them out as strong winds to whatever direction it faces. This means that a fan will blow hot during hot weathers, and cold, in a cold weather.
Airconditioners on the other hand, work in a complete different way than a fan. Thats why it's called airconditioner, to condition the air. With an airconditiiner, one can simply make the atmosphere around any given room suit their needs. Hence, i see no reason why I should pick or substitute an airconditiiner for a fan.
I've heard of certain minor health risk which has been associated with regular and constant use of Airconditioners. For me, i haven't experienced any, so I doubt these health risk were actually even caused by air conditioning. And even if they were, then its probably because the users failed to condition the air in a way that suits the environment and also is proportionate to what their bodies need.