I'm pretty disappointed with Kallus. He brings nothing new to the Empire: Infiltrating unit with chip damage on range 3 (Iden), Charge units (Royal Guard, Dewbacks, Vader), Cunning (Krennic). Only Contingencies might be interesting. But at least his 1-pip is not overwhelming and I don't see good synergies with other units yet. And i really don't like units with expansive but basically necessary upgrades. Without his 25pts weapon Kallus is basically useless. With it, he is at 115 points, this is not a bargain. I wouldn't take him in competitive games as he is now. We'll need to wait for his other command cards and of course the flaw card ...
Lando is better in that perspective. Since Rebels play Hero-heavy already, his contingency will do a lot. His spoiled Card has a lot of cool interactions already and I would like to see contingency effects on his other cards as well (though they lack the bar in the text on the preview image, so probably not). His guaranteed 1-2 wounds on range 3 are nice though Cassian has that as well for the same price and an option for infinite range, 2 sniper teams also cost about the same. So as it stands now, I see Lando as quite interesting but not very strong. We'll need to wait for his other command cards and of course the flaw card ...