Honestly, I love them all. It's a great mold and I have every variant that I'm aware of, but hands down for me, the Armada version is the coolest, only because she looks sooo eeeevil
in those colors. It's really striking.
I could never pick just one though. I'm a Beast Wars variants freak, especially when it comes to the Transmetals/Metals line. You should see my Beast Wars 'Dinobots' collection. I've got all of them, including the ones from Armada, Universe, and Beast Machines.
I'm obsessed, I need help. I have like 6 versions of Transmetal Rhinox and too many Transmetal Rattraps to count. Maybe someday I'll share some pics of my collection so you can see how truly obsessive and disturbed I am
But yeah, seriously, Armada. That dark purple/gray and the bright blood red with the little splashes bright blue just look amazing.