I run a set of Linkwitz Orions I put together in 2006. They use the SEAS millennium tweeter. In fact, being an open baffle design, they use 4 of them. Two facing the front and two facing the rear. I believe theyʻre crossover at 1000 hz. Very expense, but thatʻs because they have exceptional power handling.
They have a mid-range that I find to be unsurpassed on acoustic piano, voices and acoustic instruments. Just incredible.
That same tweeter is used in any number of hi-end commercial systems, not the least of which are the $14,000+ designs from Joseph Audio.
I canʻt speak to the hard dome tweeters youʻre mentioning, but the SEAS millennium tweeter is just amazing. Not cheap though...