Which W!Tharja?

I have a -Def and -Res, both have +HP

Since she comes with Close Counter, I would think that -Res would help as she would have more Def to take a physical hit better. Also, I don't need ploy skills on her as I already have my Lute for that. Lastly, weapon refinery can fix the lowered Resistance.

But, -Def doesn't lower her Iceberg damage, and can also be fixed with weapon refinery. And 31 Def is still decent.

Of course, I could go Resistance refinery with -Def or Defense resistance refinery with -Res and press her strengths.

What do you guys think?

Also, side note, do I merge? Or do I fodder her Vengeful Fighter off to someone? And if so, who would be a good candidate? I was thinking about Sheena as it would be better than Quick Riposte, but I'm not sure if the Slaying Axe would stack up with the passive. If someone can confirm that, I'll be on my way.

P.S. I have Aether fodder so tell if that is a good option with Vengeful Fighter.