Marketing funnels focus more on brand recognition and image. The purpose of a marketing funnel is to create customer interest. The end stage of this funnel may be to convert a prospect into a lead by convincing them to sign up. A sales funnel focuses more on conversions and sales.
While the sales funnel is dedicated to sales, the marketing funnel is more focused on generating future opportunities. Marketing funnels and sales funnels often go hand-in-hand.