[Formendacil]

One thing that hasn't been mentioned in this catalogue of Dwarven battle-preferences harkens back to the First Age. From the Silmarillion:

Originally Posted by Of the Sindar

Therefore he called upon Denethor; and the Elves came in force from Region beyond Aros and from Ossiriand, and fought the first battle in the Wars of Beleriand. And the eastern host of the Orcs was taken between the armies of the Eldar, north of the Andram and midway between Aros and Gelion, and there they were utterly defeated, and those that fled north from the great slaughter were waylaid by the axes of the Naugrim that issued from Mount Dolmed: few indeed returned to Angband.

Originally Posted by Of the Fifth Battle, Nirnaeth Arnoediad

And but for them Glaurung and his brood would have withered all that was left of the Noldor. But the Naugrim made a circle about him when he assailed them, and even his mighty armour was not full proof against the blows of their great axes; and when in his rage Glaurung turned and struck down Azaghal, Lord of Belegost, and crawled over him, with his last stroke Azaghal drove a knife into his belly, and so wounded him that he fled the field, and the beasts of Angband in dismay followed after him.

Originally Posted by Of Túrin Turambar

But now at last they had dwindled and died out of Middle-earth, all save Mîm and his two sons; and Mîm was old even in the reckoning of Dwarves, old and forgotten. And in his halls the smithies were idle, and the axes rusted, and their name was remembered only in ancient tales of Doriath and Nargothrond.

Though not necessarily conclusive, these texts definitely support the supposition that the axe was the main weapon of the Dwarves--and it is a case outside Durin's Line. It's also interesting to note that the armouries of Thingol were partially filled by Dwarven smiths, listing axes as first among the weapons of the Sindar's armoury.

Originally Posted by Of the Sindar

At this time therefore the Sindar were well-armed, and they drove off all creatures of evil, and had peace again; but Thingol's armouries were stored with axes and with spears and swords, and tall helms, and long coats of bright mail; for the hauberks of the Dwarves were so fashioned that they rusted not but shone ever as if they were new-burnished. And that proved well for Thingol in the time that was to come.

Indeed, it seems to me that the Sindar have a preference for axes as their chief weapon, and since they learned the making of weapons not from the Noldor but from the Naugrim, this may be why. As evidence of the Sindar's preference:

Originally Posted by Of the Ruin of Beleriand and the Fall of Fingolfin

Then Beleg Strongbow, chief of the marchwardens of Thingol, brought great strength of the Sindar armed with axes into Brethil; and issuing from the deeps of the forest Halmir and Beleg took an Orc-legion at unawares and destroyed it

Actually, from a related quote, it seems that the Halethrim, the people of Halmir, had a predilection for axes too... but this would seem natural, given that they were a nation of foresters:

Originally Posted by Of the Fifth Battle, Nirnaeth Arnoediad

. In the forest of Brethil Halmir, lord of the People of Haleth, gathered his men, and they whetted their axes; but Halmir died ere the war came, and Haldir his son ruled that people.

And, apart from a mention of the Noldor forging axes when they were busy with their initial forging of weapons in the unrest in Valinor incited by Melkor, that's it that I could find for axes in the Silmarillion. It definitely seems to show a Dwarven bias for the weapon.