The Grudge Thrower and Bolt Thrower are superior in different way. But when it comes down to what war machine is the best, I think it comes down to one single piece of material. The Rune of Forging. In other words, staying-power.
The Bolt Thrower dosent have to worry about that, but then it has to make a decent roll. Giving it an engineer, increases the chance but you still gotta to make the hit.
The Grudge Thrower is able to hit quite a number of models. But, it has two dices that can turn the table for it. In addition to that, when enemies close in, their usefullness descreases, with the 12'' min range.
On to the canon. It more or less have, what the two other war machines lack. Its very hard to destroy. It packs quite a punch. It can shoot at short distances and its got the Grapeshot option. You just have to make a somewhat decent guess, and its likely to hit what you aimed for. Unless you got, one of those days ofcourse. It makes a bit more expensive, but its deffinetly worth.
But all in all, this discussion give players, a really good insight in the dwarven artillery section and shows that we got some of the best pieces of equipment in the warhammer world.
Bring it on, Always Strike First! Give it your best shoot, one big fruit basket of magic! The dwarfs dare you, Eternal hatred! Give 'em hell :sinister: