DraftRank vs Surfer SEO
Surfer SEO is an optimization tool — it analyzes the SERP and grades your content against top-ranking pages. DraftRank is a generator and publisher — it writes the full, optimized draft and pushes it to your site. They solve different halves of the problem.
Bottom line
Use DraftRank to create and publish ranking content end to end. Use Surfer when you want deep, data-driven on-page optimization of content you write elsewhere.