Which Tweeter preferred- dome natural material, Beryllium/Metal or Planar Ribbon? Why?

I’m a fan or the top Seas silk-dome tweeters used in, for example, Joseph Audio’s better speakers. They just sound very extended yet musical and natural to me.  I’ve heard metal/beryllium tweets in some of the best speakers in the world, and they just don’t work for me. 

It really depends upon the execution of the design and integration in the speaker as a whole.

Almost all types of high-frequency transducers have their uses. It's a big mistake to isolate and focus on parts when loudspeakers are designed as a whole.

Done right I love them all.Depends on the design of the speaker and the other drivers.

What Eric said. In the 90's I was convinced metal domes were harsh and soft domes were smooth while amt's squaked off axis. I can no longer guess correctly what type of tweeter is playing just by listening to it.