I've found Asana to be a much, much nicer product to work with than Jira (at least as a developer, not sure about from the management side.) I genuinely wish them success and hope they're able to grow their marketshare.
Example Epics. A way to roll pieces of a project into a larger ticket describing that project. There's no concept in asana. So you have to hack it by doing sub tasks and manually adding the project to each subtask so it shows up on the board.