I generally prefer the more limited directivity since it minimizes image wander and better defines a consistent stage. This image wander is for the most part due to the complex nature of reflections and their resulting audible effects. However, in a home theater set-up the more omni type speakers tend to hold a better central image for those sitting off center and, add a bit of artificial life into the mix that is often perceived as adding excitment. The center channel will usually ensure the central image for off center seating but, the onmi mains help in this regard.