S!Sharena: +Def/-Res or +Res/-Def?

Any help would be appreciated.

+Def is great for her, because she's able to tank a lot more hits from melees/ranged physical users, as well as dragons. However she doesn't have potential of being a great mage tank. +Res on the other hand side gives her beautiful 36Res (w/ Summoner Support 38), and even with Life and Death she won't have any major problems against mages. The problem is that the risk of being ORKO'd by physical units and dragons (Grima as a common example) is much higher.