Of all the things I have tried so far, my favorite is HSTs cut with the Accuquilt Go!
My second favorite method is Thangles. It may possibly be even more accurate than the Go!, but I don't care much for removing the paper (although makes a decent mindless task while watching tv).
Edit: I can see where the Triangulations software would be very similar to using Thangles. Will have to put that software on my wishlist.......