Who maintains RPM?

Who maintains RPM?

Is there something technicallly advantageous in deb packages compared to rpm packages or other way around?

Like does either of these systems have superiour dependency handling tools for the package developers, or better syntax for handling those dependencies.

Or are these tools just offering about the same level of functionality while being incompatible with each others and requiring that the app packagers need to handle both of the syntaxes. In that case maybe it would go a good idea from fedora to jump also to jump to use debian packages by default. At least for the end users that could be a win in the long run.