I'd like to start by giving a small taste of the apps that I commonly use and explaining the pros and cons of each. One of the main differences I prefer iOS over Android tablets and phones is the wide range of apps in this category. Although there are a few that exist for that platform, there aren't as many with the polish and performance of Procreate, Sketch Club, Art Rage and more. Not to mention there are a lot more accessories such as the HoverBar and styli like Pogo Connect or Adonit Jot Touch that have advanced features unique to the iOS platform. That being said, here are my essential iPad apps for graphic design.
