are the Teraflex adjustable to tweak your alignment? what makes them special? I assume they'd be grease-able, which is nice but not a deal killer.
If they are only a "heavy duty" option, I kinda agree with Darren. Balljoints just aren't a common failure point (and the couple I can think of were 30 year old originals). a good brand of stock ones should last a lifetime (unless you're jumping the truck, and even then the axle usually bends/breaks first). Moog/Dana would be my choices.
to address your question, I believe that the not-knurled are the ones you'd want.