Ribbon has a distinct radiation pattern. It suffers from distortion at lower frequencies.
Berylium is good but may suffer from undamped ringing in the audible band ( as does most rigid material )
Diamond is kind of a stiffened fabric dome a kind of composite material design - so it has some internal damping which is good but also extremely rigid - to me this would be best of the three - however it is ridiculously expensive for what it does - who needs anything above 15 Khz anyway?
Berylium is good but may suffer from undamped ringing in the audible band ( as does most rigid material )
Diamond is kind of a stiffened fabric dome a kind of composite material design - so it has some internal damping which is good but also extremely rigid - to me this would be best of the three - however it is ridiculously expensive for what it does - who needs anything above 15 Khz anyway?