Great question, @moonboots! I guess it is one of those right tool for the job kind of answers. We’d need to have an idea of what @John_Howard1 intends to do other than 1) emit particles and 2) rotate them randomly. You asked about advantages “when Emitter is not used for animation of course.” I think you mean, that animating particles using the Emitter option is a clear advantage over Hair, is that right?
So, though rendering an animation with animated particles is an advantage of using Emitter, some people may want to render a still that includes particles that have been emitted using Blender’s unified physics system.
Additionally, Blender’s UI often removes options that are not available with the current context or selections. When you choose Emitter, you have some unique settings for particles that aren’t available when you select Hair - and vice versa.
If you don’t need hair, you have better, more specific settings when you select Emitter. Those settings are simply hidden if you don’t select Emitter. Right tool for the job, I guess.