Swamp coolers work best in hot & dry areas. In humid climate swamp cooler may lead to excess humidity, along with the mold. Air conditioners work well nearly in all climate. Indoor swamp cooler works well in dry climate whereas air conditioner cannot be used in dry areas. Swamp coolers are more energy-efficient than air conditioners. Swamp coolers are less costly to run and maintain. Air conditioners are more expensive to maintain. Swamp coolers are quiet & energy efficient & air conditioners are more expensive to run & uses a chemical that emits CO2 emission. So I would suggest you swamp coolers are better than air conditioners.