Just taking into consideration the material alone whether it is a metal (aluminum, titanium) or soft dome (silk) is not enough to quantify any differences between them. Ideally you want a material that is light, rigid/stiff and has good damping. There is a lot more to a tweeter than just the material used.

Unfortunately I have never heard of those speakers before.

I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne