That 15 fire resistance is imaginary just fyi.
you are better off with jordan.
Item Comparison Tool
If you're a tinker, you're out to min/max your characters, meaning you are going to minimize the stats you don't really need and maximize that stats you DO need. Feral druids want Hit > Stam > agility > crit, probably in that order. There are not many ways to prioritize agility > crit over stam in this bracket, so it's generally not going to make a difference.
With the BoA chest and helm, you are @ hit cap already, so the hit from the staff is a wasted stat. The BoA helm and chest are absolute best in slot for the stats they offer, there is no better way to get hit capped without losing out on other stats as well.
Due to the fact that you are a melee class and you have a limited mana pool, you would never be using your mana to dps/heal anything in such a manner where 39 spell power is going to make a difference. You might cast a regrowth and a rejuve every once in awhile, but most of the time your heals are going to come from someplace else and you're going to be spending that mana on roots and shifting.
The 4% damage reduction is a drop in the bucket of damage people are going to be dealing to you. 4% of a 500 damage crit is 20 damage, meaning that you're still taking 480. The resil is not that helpful @ 4%. If it were 40%, then you'd have a solid argument and any intelligent tinker would be taking the staff regardless of the other stats.
I just finished a 19 feral druid and I chose the mace over the staff. The above, is exactly why.
weapon damage matters, if you would know if you were playing when druids were briefly using jeweled fishing and bone fishing poles, before they were nerfed
use any weapon as a druid and add a +4 sharpening/weighted stone....it matters
Weapon damage does not matter, since weapon damage is normalized around the weapon speed. With ferals, their weapon speed is also normalized around the shapeshift form they are in. BoA are all designed to do the same DPS (1 hand mace does same dps as daggers, 2 handr mace does same dps as staff) which translates to their damage range according to the speed of the weapon.
Since feral druids have a base attack speed of 1 second in cat form, you are going to get the same damage range from the mace or the staff because of cat form's damage normalization. Even if both the mace and the staff are enchanted with 25 agility, the mace will do slightly more damage because it has 6 base agility on it and the staff doesn't.
You would lose agility and crit if you went with the staff.
Adding a sharpening stone won't change the DPS between the mace or the staff, even if it weren't a feral druid. The sharpening stone adds 4 damage to the attack itself, and not the weapon's damage.