For me, my room wouldn't allow me to use dipoles, so that decision was made for me. I'm in a bonus room over the garage with an angled ceiling to a point, then the ceiling flattens out.
I have to use bookshelves. The argument for dipoles is the output from them sounds more diffuse and isn't localizable. It just adds ambience to your movies.
If you're listening to multichannel music or playing surround gaming, then you might not want sound back there which isn't localizable.
So, it's up to how you're going to be using it, the limitations of your room, and your preference.
Have you listened to the speakers you're considering buying?