All three things Teflon tape, Anti seize and grease will work. Grease, for moving parts like ball bearings. Anti seize on something that does not move, like seat posts or press fit things. tape is a little more convenient on threaded things. But grease and anti seize will work on threads too. If you already have grease or anti seize, no need to go to the store. However, the tape is cleaner.
I have used all three on titanium bikes, for a couple of decades.