Obviously, your front stage is the most important like limomangus said, but I'm assuming you're only asking about surrounds.
Side surrounds speakers should be better than rear surrounds. Side surrounds still has some direct sounds generated (in movie soundtracks). The rear surrounds are more for ambience and reflective sound.
Side surrounds speakers should be better than rear surrounds. Side surrounds still has some direct sounds generated (in movie soundtracks). The rear surrounds are more for ambience and reflective sound.