I've got one glass carboy, many Better Bottles, a plastic bucket and some PET 1 gallon fermenters that used to be apple juice bottles.
I prefer using the bucket because I can pour the wort in and get a healthy froth going, assuring my wort is aerated. This, however, is JUST as much mental as anything else in my experience, since other than my first batch, I have yet to have active fermentation in more than 6 hours.
I use, but avoid my glass carboy simply because it's heavier and I feel less confidant moving it around, especially considering that I seldom move it with totally dry hands.