Guess it would depend on what other equipment is being used, but after hearing the KEF Q500, MA RX6 and KEF Q700, the Q700's sounded the best to my ears. (Using Marantz CD6003/Denon AVR 1912, due to have the AVR 2310 at the time.)
They also had more bass than the Q500's, but as my room is small I felt the Q700's bass may have been too overpowering, so happily opted for the Q500's at the time.
Since then, I have paired them with the Marantz PM6004 and they are superb, IMO.