As I was looking through some of my beadwork, I realize that the one stitch I use consistently is the spiral stitch. It was one of the first stitches I learned. It is easy, versatile, and always looks good. You can change the number, order, and size of beads, embellish the heck out of it, and use all kinds of clasps. It is great for making lariats and adding fringe to the bottom. It is also fast to make, once you choose your beads. I love the double spiral stitch as well.
And now, for my least favorite stitch: Right angle weave. I think if you have a mathematical or analytical mind, RAW is the stitch for you. I am competent in using RAW, and have used it quite a bit for bracelets that I embellish. I can even make a RAW four sided rope for a bracelet or necklace. But do I enjoy it? No way...and it is such a popular stitch right now. Marcia DeCoster and Rachel Nelson Smith excel at RAW and I am in awe of how beautiful their creations are. And that's just the way I like it, looking and enjoying.