depends on the turns and conditions.
Generally slower speeds you are going first use foot tipping, followed by the leg from the femur below and try to keep the pelvis from banking into the turn. IE foot starts the tipping , whole legs follow, pelvis stays level. Slower speed applies to most peoples free skiing.
Higher speeds IE GS and larger turn radius being done carved, the above can work, but some(not all) WC skiers like to use a fair bit of upper body inclination to start the turn, even if they end up with more angulation and the femur to pelvis joint near the end of the turn. The vast majority of people never feel even 60 percent of what a WC skier does in GS., if you one of those people learning how to do those GS turns both with foot tipping, and whole body inclination can have merit. I personally find on my Big mountain skis, and real deal GS seem to like some upper body tilting along with the leg tilting in the the start of the turn.