Have both Arty Chans and field both.
Having a second of them does not change much, since fielding both at the same time is mostly not needed.

But they'll blow up more than their 4 gear cost and if able to zero in on a deathball or enemy commander, win the game.
And given how squishy they are, having a second "i win" is good, always worth to sacrifice a spot on team for a second "I win".