It depends on the quilt I'm working on I guess. I have an "Omigosh" half done and there were so many pieces in that (thousands) that I cut some then sewed some etc - needed the "break". Also, there was no way I could have kept track of all the pieces if I had cut them all first (even though it was strip pieced). In fact, I had to keep my pieces in a tray and work from the tray.
The one I am quilting now I cut all the strips first, then pieced, then cut the applique pieces all at once.
Some quilts that didn't have a lot of pieces to it I cut all the pieces first, then pieced it.