[Shovah32]

I have to agree with Micah. Survival is the first thing you should take into consideration when making a SC. Get the usual sort of stuff such as high protection/defence, luck ect and then start to think of what your SC wil have to fight. Will the enemy be casting magic of a certain element that you will need resistances for? Does the enemy focus on spells that are negated by magic resistance? Does the enemy have special national troops(eg Niefel Giants with their chill aura and very high strength) or summoned troops(abominations anyone?).
As a last note(only IMO):
It's almost always better to get a very high defence value or protection value(my usual choice)with a reasonable amount of the other rather than just quite high in both. Of course you should generally try to have a reasonable amount of each(pure protection and AN weapons will destroy you. Pure defence and AoE can do the same).