There is no superior way of meriting your smn.
The magic attack and acc are more favored towards the merited BP's. So moves like Pred claws will kinda fall short. But that would depend on gear. Now if you had the acp body to compensate, then you could find the perfect balance with augments to balance out what you merited.
You can specialize in one like you stated. But if you do, I would do Physical, mainly because they are used at a higher percent of the time when fighting mobs, whether end game, or exp. Id say magic is more for show. Just look at how many mobs take physical dmg, vs the ones that take magic dmg. Ultimately its how you plan to play.
Keiyoshi **77PLD>** <80SAM> <51THF> <50RNG> <40WAR> <40BLU> <42RDM> <42WHM> <42NIN> <41BLM> <52MNK> <76PUP>. <43BST> <25COR> <76SMN> <39DNC> <SCH38>
WoTg- (Sandy nation)- in progress
Kayle is no more....
To quit before you start would make the start of something poor. Your only as good as the effort you put in.