To scroll a staff... 20's or 30's ?

Q: Which would be better if you want to scroll an end-game staff?

9 x 20%'s (+7Matk each, 63Matk total)

or

9 x 30%'s (+5 Matk, +3 INT, 45Matk, 27 int)

Assumptions:
INT% is 150%
You can afford cash shop protection scrolls/wards and whites/pam's

I'm going to guess that the 9x20's would be the way to go...