Since I haven’t played any of these amps, I can only tell you what I’ve read and watched on demos. From Nik (owner of Ceriatone)- the Gargoyle is the most modern but has less gain than the other two and is the tightest. The Yeti is tighter than the Chupacabra and more classic modded Marshall voiced, but can get into modern metal territory if set up that way. The Chupacabra has slightly more gain and snarl, with a slightly looser low end. The Yeti seems like it can do thrash and death metal tones without the need for a boost.
I’ve seen videos of all three amps sounding killer for metal so it’s really just a matter of preference. Since I use a baritone I’m always looking for a tighter low end, but also love the more classic voicing of the modded Marshall camp so I went with the Yeti.