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Empire: Swordsmen or Greatswords, depending on who you're facing. If you're facing a low initiative / strength army (Goblins, Dwarves, Undead), Swordsmen have the advantage of striking first and having a decent armor save. Greatswords match the armor, but - while doing better against things with a higher initiative - lose out more when fighting things of higher strength (losing more points / model with each casualty). Facing Elves? Take Greatswords, maybe handgunners. Pushing back undead? Swordsmen should be fine.
Orcs: Black Orcs or Goblin Netters. Black Orcs get the best armor save an Orc unit that could occupy the building could have, and being WS4 / S4(5) they can reliably put a few wounds back. Taking the Banner of Butchery isn't a bad idea either, seeing as it'll give you A T4, 3+ save unit with potentially 2 S5 attacks each.
Netters work under the principal that you're denying enemy strength bonus' from charging weapons (lances for instance), and then causing further strength penalties so that the enemy (hopefully) needs 5's to wound and you get a 5+ save. Fanatics are thrown from the building too, to cause a few casualties. This unit really needs a general in leadership range though, as it'll still probably lose by 1 or 2 a turn.
Daemons: Plaguebearers or Flamers. Plaguebearers are now -3 to hit via shooting (one of their biggest softeners), while in combat it's a unit with T4, 4+ Regen, and a 5+ Ward. They're almost promised to dish more wounds than they take, meaning they're almost promised to win. Flamers do lots of stand-and-shoot attacks when charged and sniping enemy units that wander too close to the building.
Ogres: Gnoblars. Lots, and lots, of Sharp Stuff stand-and-shooting. 40 S2 shots is enough to cause a panic in most non-Immune to Psychology units. Plus, they're directing a likely powerful unit to dig out a dirt-cheap unit of yours.
Dwarves: Practically any unit can do well holding a building. You can't shoot a unit of Dwarven gunners out of a unit via conventional means (-3 to hit, T4, 5+ save), good luck breaking a Dwarven unit with armor out when you rely solely on kills (especially if a character is left in it), etcetera. Even slayers are great, as the enemy can't break the Dwarves from the building until every single slayer is dead.
All I can think of for now.
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