In reply to robhowell:
adze on one and hammer on other. Makes a huge difference in my book.
hammer is useful for pegs, tapping out gear, checking if a flake sounds hollow or helping to set the other axe. You make a mess of the aluminium heads when you don't have one and get desperate. It took me 20mins once to place a warthog without a hammer, i was exhausted and the aluminium was a mess after.
Clearing rime from rock without an adze is a f*king nightmare, especially when pumped. It also gives you two different tools, so if one doesn't work in a placement, the other might. The adze is effectively "nut" shaped, and wider than the other tool, so will wedge in cracks that the regular axe will rip straight through.
I certainly remember one point on central buttress on Beinn Eighe on the difficult part of the last pitch where there is a parallel crack which held the adze perfectly, my partner didn't have an adze and it was a much bigger struggle for him.
Post edited at 10:33