Life and Death or Fury on Linde?

I like Life and Death 3 for the pure offense. You probably won't have her take any source of damage anyway. Although people may argue Fury 3 is better for the defensive stats but as long as you have other units to check her counters you'll be fine running Life and Death 3 to ensure you double your opponents while also hitting back hard.

If you have lod3 to give it's fine. Don't bother using her on a defensive team though a stiff breeze will absolutely demolish her.

I run LD2 and Aura build. compared to my Blade Nino and both buffed by Eirika, which are all in the same team, she is still insane. don't miss bladetome on Linde (and therefore she warps and heals 15 when dealing damage) normally she kills something instant same as Nino. unbuffed even way better