Potential bonuses for Shields?

Dragon Khanjars are better for thieves because the att on it alone boost around 6~10% overall damage depending on your total att(converting to %luk bonus, say a thief with 120% luk bonus, will be around 220%*6%=13% luk) So alien shields are garbage for thieves.

A perfectly scrolled VIP mage or warrior shield will be around the same compared to perfectly scrolled maple magician/warrior shield because of the 3 extra slot. But if you're talking about perfect 12/8/8 bonus, the VIP shields win hands down, otherwise considering 12/8 and 6/4, it comes close to matching when your total weapon att/magic att is around 265 without shield with around 140% stats bonus. Since magic att is generally higher, the bar is easily reached for mages. Plus the VIP shields will save you 3 slots to scroll.

So in summary: (given end game stats 120~140% stats bonus, 250+ weapon/magic att without shield)
Maple warrior shield/VIP warrior shield
VIP magician shield
Dragon Khanjar

For one thing, dragon khanjars have become relatively expensive/hard to find. The visitor shields are easy to get right now. I agree though, if one is able to get his hands on a Dragon Khanjar, it is worth it, even with the extra str needed.

I disagree on the warrior shields though. That extra 7% that can be obtained from the last visitor shield outweighs the extra 6-9 att one can get from a maple warrior shield.

Take very end game, a level 200 warrior with 999 str and 150 WA (not sure if this is accurate, just roll with it), using a 1h sword

1.20(4*999+23)*150/100=7234 max range

now with 21% potential and 14 WA from shield:

1.2(4*999*1.21+23)*164/100=9560 max range

now 14% potential and 20 WA from shield:

1.2(4*999*1.14+23)*170/100=9340

And it's equally rare to get 21% on the higher level shield as 14% on the lower level, but it's more difficult to get three extra 60% scrolls to land.

The same thing applies to the mage shield. Even if it's not the VIP, it still wins out.