Hello,
I got curious regarding this future decision.
The staff brings massive to the table without question.
However, its auto-cast animation is slower compared to the Rod.
(especially when run-casting
Rod gives you the opportunity for a offhand aswell.
And for this subject i picked Venom.
Which i find most effective for any wizard, in my opinion.
So lets calculate 
Lolopanther Rod + 15 & Venom
M.Attack - 334 + 250 = 584
Earth Property - 41
Poison Property - 178
Total M.Attack : 803 (686 on plate targets)
HP : 1,190 HP
Lolopanther Staff + 15
M.Attack - 434 + 250 = 684
Earth Property - 57
Holy Property - 104
Total M.Attack : 845
HP : 1,105 HP
Staff takes the lead by 42 M.Atk (159 on plate targets)
Now, i’m not sure how often you’ll auto cast at Lv.280
I don’t think 42 M.Atk makes much of a difference at that stage.
Both seems pretty equal, therefore a self preference.
PS. Im going with Rod/Venom! ;]







