Genestealers have two pairs of posable arms (with options on claw types), so are technically more posable than gaunts. Their bodies are fixed, though, just like the others. You do get a greater variety of heads and armor plates, too, which provides options.
They don't really feel "Starship Trooper", though, if you wanted to stick to that theme.
Warriors have tons of gear and posing options, but I don't know if they really count as "small".
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