Best units for meleeing down gates? Any faction, any tier.

So, I've noticed that it's not always the units you expect to be great at taking down gates in sieges that actually are. In WH2 it seems like it was a little more predictable - monstrous infantry, especially trolls, absolutely mulched gates.

What I noticed recently in a Azazel campaign, though, is Chaos Warhounds absolutely eat gates for breakfast. Like in half the time Chaos Trolls do! I was truly shocked, because I don't remember that being the case.

I'm interested to know what other units take down gates really fast, what do you use? Obviously Ogres and a few others can just take the Koolaid Man route instead, but that usually takes a bit longer.