For both Brothermark and Northern Alliance, I’ve been tracking damage output and effectiveness. Still a small sample size, but it’s interesting to see. Here’s average damage versus points per damage (so the higher the unit, the greater the typical damage; the further the right, the more cost effective the damage). The bigger the circle, the more times I’ve used the unit. You’ll see some units listed multiple times (e.g. Penitents) because of different unit sizes. I haven’t bothered to fix that yet, but the hordes have been the best performing:
You can see that the expected stars are on the top right (Paladin Monster Slayers, Hrimm, Lord on Frostfang), while cost-effective but low-damage units are on the bottom right (war wizard, siege artillery, exemplar hunter)), and the chaff/specialty units are on the bottom left (Augustus, Skirmishers, Snow Foxes). Not a ton of data yet, but it’s fascinating to see the trends so far.