What is your room layout and where is the seating locating in relation to the speakers and screen... ?
I think different types of surrounds - be it monopole, bipole, or dipole is an extremely room dependant variable.
Large rooms where you can position the surround speakers further from the seating location, monopoles will deliver a wide accurate immersive sound field....
Smaller rooms where the surround speakers are much closer, monpoles become beaming and don't cover the seating locations. Which is where a much more dispersive product such as bipoles and dipoles will smear the sound around out from the source creating a much wider and larger sound field...
I prefer monopole in my large room for the accuracy rather then the blanket effect of dipoles, in my smaller room but both are very good quality surround systems.
Here is a good picture giving a rough idea of the radiation pattens of monopole vs bipole/dipole