It costs more, but I plan on staying at my place for a long time, so I didn't want to cut corners, and I went with fiberglass. I did alot of reading/research before doing mine, and to me it seemed like fiberglass was hands down better, except for cost. Also, cellulose weighs more, and I would have been pushing the limit of my sheetrock ceiling if I had gone cellulose at the R-value that I wanted. With fiberglass I was able to get the R-value I wanted and was still only like 1/4 of the weight rating of the sheetrock. Maybe it would have been fine, but I didn't want to take the chance of the ceiling getting wavy or saggy.
For mine I did unfaced batts in the walls, then plastic vapor barrier, then sheetrock. For the ceiling I did the plastic vapor barrier, then sheetrock, and then blew the fiberglass in. Putting the batts in the walls is a little itchy, but blowing in the attic is 10x easier, and not itchy at all. I wore long pants, long shirt, gloves, and a little dust mask, and it didn't bother me in the least bit. It was the first time I've ever done it, and I'd gladly do it again. Same as the others here, the blower was free for a day at Menards with the purchase of the insulation.
