Ely 100% would get my vote there...especially since you have the M8. The VE8 is great but I think it's showing its age a little...I found the mids a little congested the last time I heard it and I'm currently enjoying the Isa more pretty much across the board.
Technicalities are good to great on every metric I can think of. I mean, you're never going to get Andro-like out of head staging or Ely like treble out of a single DD...but on its own terms it's far and away the best pure DD IEM I've ever heard. The stage is comparatively intimate but vastly deep and so alive. Vocals are the clear spotlight but the midrange in general is open, clear and well separated-- nothing feels congested, out of place or smeared. Don't hesitate to ask more specific questions if you want.
I owned the 3DT and the Isa is a vastly better balanced and more engaging listen imho. I had to mod it to sound its best and even then it had a bit to much of a "tuned by committee" feel...compared to Isa which from the moment I first plugged it in felt utterly inspired.