Down bags have a longer life as well as being more compressible and lighter. Always sleep with a high quality sleeping pad, no matter which type of bag you go with. Down won't lose it's insulation with even a few nights of condensation but do air it out when you get the chance.

I have both types and have found each have their pluses and minuses but have taken to down recently because of their lifespan, weight, and compactness. I just never let my down bags get wet.