Bunkr has latched onto a need; to take presentations from the desktop into the cloud.
They've taken a different route to Prezi and Slideshare and seem to be concentrating more on facilitating a slideshow that is comprised of a series of online resources.
Its an interesting approach and quite different to the others who have relied on making their presentations slicker and more shareable (although I find Prezi's navigation can be rather nausea-inducing).
It's far too early to say who's on a better track but it's good to see a properly new approach. And there's likely plenty of room for both.
But Bunkr’s true power lies behind these buttons. For example, when you click on video, you can either browse directly videos on compatible services or paste a URL from YouTube, Vimeo, Vine and many more services. It works exactly the same way for charts with Infogram and Chartblocks support, tweets, Facebook posts, SoundCloud songs, GitHub Gists, Sketchfab 3D models and more.