Technique should be secondary to the final product. What is your conception? What do you, as knitter, want to produce? If I am working on a school sweater for a young, athletic child -- lots of running, playing, and moving involved -- I use durable yarn, lots of acrylic, machine washable and machine dryable, and a design that allows for movement. Usually a knit-in-the-round design, maybe using cut armholes or cut front for a cardigan. For a young woman's formal wear, I might use a tailored design, done flat on two needles and with seams to retain the shape of the sweater. The yarn is usually a fine yarn in luxurious fiber, perhaps cashmere, alpaca, or mohair. It all depends on the use intended for the end product.