When evaluating the practical efficiency of a pickaxe, two things should be taken into consideration: the amount of hits required (from high pickaxe power); as well as the ticks per hit from low mining speed. The use time attribute can safely be disregarded, because it reflects the weapon swing/animation and is not related to the hits for mining.
Pickaxes can use modifiers that increase speed, like Quick and Light. Accessories with a melee speed bonus will only affect the weapon swing, and will not affect mining hits (by affecting use speed not mining speed).
Types[ | ]
There are currently 14 different pickaxes available in Spirit, 7 of which are Hardmode-exclusive.