Phiokka, now PHK, produces several different models, depends of which one you have.
The 46.6 are great bindings, if you are talking about phiokka, shoud be 5 or more years old bindings.
Have a tour at www.phksnow.com/snow
Otherwise they are very dufferent bindings, TD goes in the flex way and PHK in the stiff one.
I think that just depends in what are you looking for and which is your global setup, board, boots.