Generally the dynamics of both sets won’t be able to rival DD sets or hybrid/tribrid sets with a DD for impact slam which might be important to you for prog metal. It is for me.
Different driver sets… SA6 is an all balanced armature set. Timeless is planar. I’d look into the advantages and disadvantages of those driver types to understand if you think they’ll be a good fit for you and your library.
My sets…
Graphs…
