I have both a sleeping bag and a couple of TQs... at the end of the day, they both work but the TQs pack a little lighter AND they don't have zippers!! I've come to hate zippers in the hammock... I hate laying on the zippers. I hate the dreaded stuck zipper when trying to zip/unzip in the dark. I'm always worried about tearing the hammock with the zipper.
If you can afford to have both, the TQ is almost always more comfortable!