The Vandersteen 2c is not bipolar, it's a monopole. Def Tech does make some bipolar models. The Maggies are dipoles.
The spatial reproduction produced by each different type, depends upon the room and the speakers placement within the room. The answer then become more complex. The bipole and dipole have the potential (based on placement) to have a larger and especially deeper presentation due to added, delayed reverberation. If the delay is sufficient, it will be perceived as spaciousness. A good guide can be found on Linkwitz's website:
linkwitzlab.com/rooms.htm#D
cheers,
AJ
(sorry, unable to post a direct link until after 5 posts)