For me, the profit is shark tank on steroids.  It takes all that is good about shark tank, introduction of a new business (the pitch) and negotiations, but instead of ending there you actually get to see the changes the expert (Sharks vs Marcus) implement.  I think the main difference is the purpose of both shows.  In my opinion Shark Tank is produced to highlight the negotiations (the what), whereas The Profit is produced to show the business getting to the next level (the how and why