Third mountain is way better
Really cool thing about the first was that he had the face of a mean motherfucker. That dude just looked horribly angry and unpleasant which fit Gregor to a fault.
That said, I really like Halfthor as well.
Only the second one was problematic.
Speaking of Gregor, I rewatched the "I choose violence" scene. Once again, awesome acting by Lena there. I really dig how confident she plays Cersei throughout, "It is a request, Cousin Lancel, you're asking for something and I'm refusing."
But then, as she did so well in the scene where she got revenge on the Sandy Vs, she also conveys a moment of vulnerability there when she asserts that the High Sparrow promised her that she would be able to stay at the Red Keep until her trial. In that moment, it's as though she's just trying to reason with them and doesn't want any trouble.
But when Lancel continues to be a dick, we get Frankemountain stepping in. Lancel says, "Step aside, Ser" and you just get this close up shot of FM- heavy breathing, dead eyes- crazy shit. Probably my favorite scene from that particular episode.