The only advantage that Fiberglass has over Cellulose is weight, and in most cases, that is a none issue. No, it doesn't "Evaporate" and disappear. As far as dusty, it is while it is installed, but so what!
As far as fire-resistant, fiberglass by nature is non-flamable. That doesn't mean that it stops fire from moving through it (hold a torch up to a piece of batting and see what happens). Celluose, since it is wood fibers, is not in itself fire resistant. Chemicals (usually borax and boric acid - both rather benine in nature) are added to make it fire retardant (put a torch to it and it might smoke while the flame is on it, but take it away and that's the end of it.).
Celluose however is less given to allowing air or fire to move through it. An isurance adjuster told me that he has had several homes with attic fires saved because of cellulose (the fire just smoldered underneath it, being confined by it, until the ceiling fell down exposing the fire.).
As far as performance, cellulose will usually out-perform fiberglass. In attic applications in extreme climates, blown fiberglass looses some of it's R-value due to convection thru it (cellulose maintains or increases it's function). at -18degrees F blown fiberglass' performance is cut in half (R-40 is now performing as R-20).