My weigh in:
cygnar- gallant. He just gets way more even without the affinity so he pulls a little more ahead of triumph.
Khador- not too sure, but I think they both are very much niche jacks, but I like torch, he's pretty spunky.
On to those I actually know about:
Retribution- Hypnos is godly with ossyan, and pitiful without, so discordia gets it for being always good. Hypnos denies so much to stuff and has the boxes to take a few hits while locking it down, but he really is second rate without timeboy. Discordia has sprays and some solid all around goodness which always has a solid use.
Protectorate- I think scourge wins by a long shot, just a lot of stuff for a Jack, compared to BoM who only fucntions well with thyra. Blood of martyrs compares to molik karn, but it's with thyra only, although he is ridiculous carving through stuff. Scourge can still thresher, and has tools to hurt warjacks too making him decent on his own, and oddly enough reznik doesn't need him at all (ohher than for style points)
Cryx- I cannot believe this, and I'm sure dan will have death threats, but... Erebus wins. From what I see and have played, people put hype behind malice because of the withershadow, but you could do that with a reaper(obviously not as cool though). But Erebus is such a pain in the ass to deal with. Def14 means if a Jack misses it's going to get pushed out of melée, plus overtake works well with a few casters.