How To TH Proc

A debate has risen among my LS regarding TH and the most efficient/effective way to proc it on THF. I call upon my fellow THFs to help settle this argument.

Argument #1 - TH gear (incl. Thief's Knife) only needs to be worn for the first few hits when engaging a mob, then you may switch to your desired tp set.

Argument #2 - When TH is required it is best to full time the TH set to most effectively raise the TH level (I'm being told wearing TH entire fight causes more TH procs).

If you could let me know which view is correct, I'd appreciate it.