I tend to use the Big Book first, but have no issues with supplemental materials and different approaches if the person I am working finds inspiration in other ways. Not every person's learning style is linguistic. Some people learn by doing, by hearing, by visual, etc. If someone I work with obviously learns the best by visual or auditory, I am doing them a bit of a disservice by making them read only. I had a sponsee recently who is visual. For the 7th step we made lists of shortcomings and did a balloon release so we could "watch" them drift away. That's not in the BB, but it felt spiritual and useful for this person and their natural way of processing information. Auditory learners can benefit from listening to Joe and Charlie and speaker meetings on steps.