Generally a more wide song will sound better in headphones, but will potentially hit less hard than a track that is less wide.

Tracks without a lot of stereo width also sound more uniform across different listening scenarios (club systems, car stereos, laptop speakers etc) as they don't rely on panning to achieve their sound.

The decision ultimately comes down to your own personal taste, and we encourage you to try all different settings for Stereo Width to find the ideal one for your track and vision.