I've pulled a Celica and I still have my doubts in picking Veronica
For armors
I've Been using a Fully built Sheena +5 for now, Hardin, Armored Lyn, and Black Knight.
My Main Team for everything for now is Marth +10, Flying Olivia, Sheena, and Lyn for Armor March and blue coverage
So still undecided who to pick
Go for Hector but that's just my opinion, just go with whoever you like better as a character.
He is really really good and his only real rival is Hardin which at this point is powercreeped by Hector.
Ephraim is good but with the competition, that being HECTOR he does'nt really stand out(Except for his weapon Garm).
plus hector has a Broken skill set while Ephraim does have a pretty good skill set but not as good as hector's.
It looks like you'd benefit more from the Hector than Ephraim, purely based on color.
With that said, it's unlikely you'd be getting high merges on either anytime soon. Personally, I'd go with Veronica. Despite how OP the unique skills are on these new armors, Veronica's kit is even more unique and there isn't really another unit that can do what she does.
Yeah pick Veronica she is great. She buffs your team very much and can help. Plus she is great for most maps. I suggest you pick her and you will not regret it. It seems you have alot of armored units based on what you said so that's why I'm chosing veronica since it appears you don't have alot of healers. Then again, you can choose whoever you want, so up to you in the end.
Hector is usually considered to be the best pick. And looking at your main team, it's clear you'll benefit more from him than Ephraim. Unless you want to drop Sheena but I suggest you go on merging her.
Hector can take Lyn's place in your team and he'll be much more effective than her. The only problem is, you'll need to give him Armor March.
If you can't make up your mind between the 2 armors, go for Veronica. She will always be useful to clear content.
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