I'd have to throw my vote to TWO-TUBES if I could have only one more figure from Rogue One.
Alien, I know, likely never see the light of day from HT anyway.
But I find Cassian to be such a boring figure. He's like an accessory for my K2 and Jyn.
There's a few other figures I'd prefer:
Tank trooper
Shore trooper (grunt)
Saw Guerera -- he's actually quite intricate, despite what you may think of the performance
In a Jyn DX they could have included Cassian as a hollow PVC figure with limited articulation.