If you're allowed, the brute is auto-include with the custom twin-linked heavy stubber. it's insane, and better if you can get the xp to upgrade its shooting stat. Long term it synergizes stupid well with the brute handler hanger on.
But even just when you only have 1 slot for brutes/hanger ons, its worth including over a rogue doc.
In terms of the weapon options on your house list, the following is strong;
S tier; Blunderbuss with polearm, Grenade launcher with smoke ammo
A+ tier; Shotgun(executioner & retributor ammo), stub gun(also with dumdum ammo)
B tier; Exterminator(clips onto stuff) reclaimed autopistol, reclaimed autogun(with or without the polearm), Eviscerator
C tier; Long Rifle, sawed-off shotgun, autopistol, autogun, greatsword, chainglaive & the three melee weapons with exterminator
D and below tier; Heavy Crossbow, Heavy Flamer, Heavy Stubber, flamer, hand flamer(normally this is B tier, but we have cheaper polearms), Fire pike, all the other melee weapons.
So basically, when building a gang, just pick out a number of dudes, and the stronger you want your gang, the more weapons you pick from the high tiers, making sure you still have enough juves around to use the cawdor special rule.