One heart available. It saves a stranger or your enemy. You decide.

The enemy deserves a second chance. We all mess up. Stranger could be terrible too for all I know.

saving the enemy is just spite wrapped in nobility

Depends what the enemy did tbh. If they hurt someone I love, stranger gets the heart. If it's just a rivalry thing, maybe I reconsider.

Stranger wins every time. No baggage, clean conscience.

Enemy all the way. At least I know what I'm getting.

This is actually impossible to answer fairly. You're asking me to value a stranger's life over reconciliation with someone I know. I'd save the stranger.