Which do you think Damiano works better in?
Four Star Syndicate or the Highborn?
Personally, I think the Highborn.
My reason is a deadeye Mule can end games.
Now both contracts can take Mules, but the Highborn can marshal it with the Gun Mages for Snipe or Crit Brutal. Gun Mages themselves are good targets for deadeye.
Also a def 15 Gallant (sure foot) which can't be knockdown and has Shield Guard is pretty good. And he can get a free foc by a 2 pt solo (Harlan).
Anatasia in combination of Damiano's feat is also pretty neat (and works well with the steelhead trinity via Tactician).
Four Stars does has its merits:
Croe Cutthroats that can hit are dangerous. My problem is until Wyshnalyrr comes out, Range 6 of Dead Eye is dangerously close to a stealth unit which won't block LOS to Damiano. Rng 8 is a bit better. Cutthroats with Vengance isn't bad but I like the ability more on Steelheads.
Aside shooting, Kayazys (either flavor) are devastating with his feat. Wrong Eye and Snapjaw as well (but the rest of Wrongeye's battlegroup is minon only so won't benefit).
I really can't think more what the Four Star can do for Damiano. It potentially more deadly on melee assasination runs (shooting to some degree via cutthroats), but overall Highborn is more balanced and can be potentionally game ending with a superior ranged Mule.