Opinions on Arena teams

I've been working through my units to see who would be best for Arena matches. So far my team of Black Knight, neutral Winter Tharja, +1 neutral Amelia, and +1 Atk+/HP- Reinhardt are doing pretty well with me sitting at what's in the screenshot. However, I've been tinkering around with making an actual Armor team to try and avoid using Reinhardt so much. My armor team will consist of:

Black Knight: Steady Stance, Vantage, Ward Armor, Deflect Magic 2 Seal, Swap, weapons and special are already obvious

Winter Tharja: Neutral IVs, Summoner Support S-rank, Candelabra+ w/ Res, Close Counter, Vengeful Fighter 3, Ward Armor, Distant Defense 3 Seal, Swap, Iceberg(don't have a spare Felicia or Fir at the moment)

Amelia: Neutral IVs, +1 Merged, Slaying Axe+ w/ Def, Earth Boost, Seal Defense, Armor March 3, Panic Ploy 1 Seal(ran out of Sacred Coins for the moment), Reposition, Sacred Cowl(ran out of Bonfire fodder)

Winter Robin: Spd+/Res-, Tannenboom+ w/ Spd, Brazen Atk/Spd 3, Vantage 3, Armor March 3, thinking Close Defense 3 Seal, Swap, Bonfire(the unit who took the last of my Bonfire fodder)

In case anyone says anything Amelia's skill set when combined with a defensive tile can tank even hits from Black Knight during the enemy phase, EVEN NO-SELLING BLACK LUNA. Tharja, even at neutral, can even deal with Reinhardt while dealing a crap ton of damage back at him and weakening him enough to be taken out by the other members of my team. She's also able to take hits from a Brave Lance+ Effie, though that leaves her very weak.

Honest opinions are greatly appreciated plus Merry Christmas and Happy New Year to my fellow summoners!