Is Wings of Mercy or Vantage better on BK?

Do you have armor march? Is it for a defense team or are you piloting it?

I would say WoM would be better for a defense team armor emblem whereas Vantage is better in a player piloted armor emblem. If you have Armor March though, Vantage might be better in both, but WoM is great for Defense.

Depends on some variables. WoM is good for mobility and catching units off guard. Vantage is good for defending yourself. Proccing Black Luna on foes that trigger your Vantage and what not.

As an arena player, I sigh with relief whenever I'm up against a BK with Vantage, because it means he doesn't have WoM. But if you're not using him on arena defense vantage could work too.

WoM. BK wants to take a hit and then proc Black Luna instead of hitting and then filling up the charge.