One of the most common questions we receive at RØDE is “Should I use a Mono or Stereo Microphone? Which is better, and why?” To an audio newcomer, it seems quite obvious; stereo always sounds better than mono, and a stereo mic generally has a higher price tag, so it clearly must be better. Right?
Unfortunately, it is not that simple. Both types of microphones exist for very specific reasons, and the reason you would use one over the other is heavily reliant on your recording situation and environment.
Source: Rode Microphones