I like that Dojo has a lot of stuff built right into it, whereas with jQuery there seem to be too many plugins. I would really prefer updating the library by replacing just one big package instead of checking for various plugin updates constantly.
I have seen claims that Dojo has more features, like the charts and font creation (which I think are very neat actually), but it's a little hard to say for sure if Dojo has anything that jQuery doesn't since jQuery is so popular and there are so many 3rd party extensions for it.
In terms of the actual implementation, I find Dojo a little odd, how it uses its own attributes on the HTML tags and embeds elements within other objects. Technically I guess there shouldn't be anything wrong with that, but I am a little concerned about the lesser browsers perhaps not displaying that properly.
Does anyone care to share why they might prefer one or the other?