According to Osho, jnana-nishtha and karma-nishtha are not opposed; they are complete routes to the same peak, each suited to different temperaments—introverts to knowledge (Sankhya), extroverts to action (Yoga/service). Because most people are mixed, the right balance varies; some need only one, others a blend. The seeming contradictions lie in persons, not in truth.
Choose the path that fits you—looking within or doing in the world—both work, and many people need some of each.