Ranked in these QuestionsQuestion Ranking
Pro Sync support via iCloud and Dropbox
Pro Mobile support
In addition to an OS X client, an iPhone and iPad versions are available as well.
Pro Trial version available
Pro Simple, zen-like UI
Pro Can automatically format layout
Allowing you to focus on content, instead of how it's organized, and especially useful when huge mindmaps get out of hand, the Smart Layout function will organize the mindmap in a way that's more comprehensible.