Here’s an excellent thread on the relative benefits of giving emblems to Gormek and Grimm: The Pulverizing Barbarians: Emblems to Gormek or Grimm?. I have Gormek exactly where you do and considered a reset to emblem Grimm instead, but after reading this thread, I decided to keep rolling with “Beefy Gormek”. Happy reading.
For me, this would be about your materials. If you still aren’t close on scopes, I would go Sonya. She’s faster to level, and at 4^70, she might be as good or better than any of your 5-stars at 3^70. I have a maxed Grimm and a maxed Sonya (+6, because my other paladins are trash), and I rather like her. The fast mana is a nice plus, and having another dispeller is always nice.
Having just finished maxing one today (since I had no other red options), I can say you aren’t missing much. For my roster, she still gets a lot of use, but she doesn’t really stand out at anything.