[Lord]

Krunchfrogg: the hammer also gives a +2 thac0 bonus, while the staff gives nothing.
And just how is it a disadvantage by having electrical damage done? Just because some creatures can resist it means that it makes the hammer suck? Well then, technically, every creature resists the elemental damage done by the staff since it doesn't have any. That electrical damage can also go through some spell protections if the weapon itself won't harm the creature.