Depends on the kind of sound signature you like.
Danish sound: neutral on-axis, off-axis roll-off
Canadian sound: neutral on-axis, neutral off-axis
British sound: recessed mids, boosted upper bass and treble.
There is no best...some people like different design philosophies.
I am personally a fan of Canadian sound--neutral sound throughout the entire listening range, from on axis to 75 degrees off-axis. This means no matter where you stand in the room you will hear virtually the same output. However, this design requires room treatments--acoustic panels--to limit the effect of sound reflections.
Danish sound--aka Dynaudio--is very smooth sounding as off-axis roll-off will automatically counter room reflections. On the other hand, it's not that great for wide-listening angles in a well-treated room, as performance off-axis will be less than ideal. But it gives you a good listening experience in a "generic" untreated room without sounding bright but remaining neutral.
British sound--if you like the sound signature (many people call this "hi fi" sound as many recordings in the 50s-70s were created by mixing engineers on speakers with this sound signature)--would be much more effective in large rooms as it would performance the worst in a small room due to compounding of reflected sound. Off-axis performance will vary depending on the model.