Prezi: I have used Prezi before and LOVE it. I was under the impression though that they created templates that you had to use, but you can still start your own from a blank canvas. Great! I didn't know that you could import your already made Power Points to Prezi. It seems pretty seamless. You can also invite collaborators to work on the same Prezi. This doesn't seem like the best idea for 5th graders, unless one kid is working on it at a time because the changes aren't automatic like in google docs. 3D backgrounds looks like something I want to play with. Also, when you want to insert an image, you can search right in Prezi for images that copyright free. Awesome! You can animate the contents of the slides like a PowerPoint. For example, making words appear or disappear. You can also add background music to your Prezi. I think to each frame.
StoryJumper: This looks really cool. You can make it as "little kid-ish" as you want or add your own photos to make it more "serious." You can crop photos to make them fit into the preloaded pictures. I have used BoomWriter before and it seems like it is similar minus the option to vote on who wrote the best chapter. It also has a storyboard worksheet that the kids can fill out before they started typing.
StoryJumper: This looks really cool. You can make it as "little kid-ish" as you want or add your own photos to make it more "serious." You can crop photos to make them fit into the preloaded pictures. I have used BoomWriter before and it seems like it is similar minus the option to vote on who wrote the best chapter. It also has a storyboard worksheet that the kids can fill out before they started typing.