Viena MACE > Windia Rod
Just saying.
‘Depends’
Elemental damage are now added after defense reduction and skill factor.
So the main pros is that they IGNORE DEFENSE
On the other hand, having higher m.atk also makes defense less effective against you so the higher your m.atk is, the less that defense ignoring value matter.
So to OP, my suggestion is this:
Get Viena Mace for your 1 practo weapon, it’s better than Windia Rod by a big margin and it can be used by 3/4 of the base classes. Get it to +6 at least, +11 if you can get there, put in red gems in it. Now you have a weapon that can be used for Wiz/Swordsman/Cleric instead of having to make 3 weapons.
THEN work on getting a strong staff if you want max damage, or Heart of Glory/Solmiki rod + shield if you want more balanced stat, save your blessed gems to transcend that one instead.