I don’t know that one is worse than the other, both can be problematic depending on the context of the work. Under-management is something more people need to consciously address, especially as more and more work moves away from a “command and control” management environment and becomes more “agile” and in the hands self-organized teams.
Micromanagement gets most of the attention, but under-management may be just as big a problem.
Under-Management Is the Flip Side of Micromanagement — and It’s a Problem Too