When a person wishes to buy a pair of tefillin and has so much money to spend. Should he concentrate more on the batim or the parshiyot? Should more be spent on nicer parshiyot or more mehudar batim, or try to keep it equal?
One should ideally concentrate on the main halachos of both parshiyos and battim. In partucular, there are many additional chumros in the manufacture of battin that are not required according to halachah, some of which were not practiced until recently, and there is no need to be particular for this. The main expense concerning parshiyos is the beauty of the script, and if necessary you can compromise on the beauty to ensure that they are properly valid.