Sega recommends using a well-rounded affix build for Hero (S/R/T atk on each unit) but if you prefer to only use certain weapons on the class then going all S atk is always welcomed if you liked to. (even though the class is setup to use ALL weapons for maximum effective gameplay).
I recommend a well balanced atk/hp/pp build as current content hits kinda hard and depending on your playstyle going all atk/pp may not be for you if you're consistently hitting the floor and with Hero Boost being fickle as it is, losing that precious dmg bonus and having to reset it is kinda a pain although Demonia series help relieve it as HB batteries and with current gear out, you may have to switch up your play strategy...or just get good, not even joking here.
Since you can't really mess up Heros Tree, heres an example of a simple build. Obviously allocate SP where you like if aren't content with the tree:
http://arks-layer.com/skillsim/skill...qnGAdAqB00000f
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