Easy setup and management of account in one place! I love that there's so many options when it comes to targeting your audience through ad sets/creatives or even campaigns within an individual campaign as well (and having all three under 1 umbrella makes life easier). It does take some time getting use too everything but once you figure out how each tool works and what they can do best you'll be fine. My only wish would have been more specific tools like custom audiences or advanced A-B testing