The Tech 3's have a billet center, the portion that mounts to the hub. CF1 is straight carbon fiber, with metal inserts where the holes are.
I have dual bead-lock Tech 3 rears that have been phenomenal. They still have the 5lbs of pressure in them that I originally filled them up with 3 years ago.
I have fought tooth and nail with one of my CF1 fronts almost since the day I bought them. One leaks between the tire and the bead-lock ring. I just ordered new rings so we'll see if that fixes the problem. Also possible the cheap GBC tires I use have an imperfection that's causing the leak. I'll find out this weekend.
You can see the diffrence here: