ok.....without getting too granular, ..........
in 99% of all the mics out there. a stereo pair is going to offer the user
more options to make a nice stereo recording.
If you are concert taping maybe consider: the ease of one stereo mic vs. setting things up, ie: cable variances, shock mounts, T bars,
clamps and so on.
The Superlux S502 can do some great things in the right circumstances.
owning one for under two bills is, IMO....totally worth the money......