Which shield is better?

[Aozora]

I need to know which shield would be better:

Stone Buckler
        or
Sacred Mission

For shield chain it said the heavier the shield the stronger shield chain.
On RatemyServer it says Stone Buckler is 150 weight but Sacred Mission is 160 weight.
Most people want Stone Buckler though, so I want your opinion and why which is better.

For stronger shield chain: -heaviest shield you can find since the weight afects the damage way more then the upgrade
For better shield altogether: Sone buckler since it has a slot. For shields slotted ones are ALWAYS better.

[Man Of Emperium]

I dont realy think thats true, I was bord awile back and desided to make a SC pally, I saw a +6 stone bukler for sale quite cheap but I remebered the debate on anima about the refined damage, so I just made a wole bunch of over upped shield[0]'s if I remeber correctly I made from +4 to +9 and used a 99 pally with 99 dex and 99 str as the control and damaged porings with no gear. The results where minimal increases from +4 - +6 and not seeing any differance after +6 - +9, well after all that I desided not to buy the +6 stone bukler and got a +6 termaran carded shield[1] just for fun.

Just tested +4, +6 and +8 Guards. The Shield Chain damage range increased every time with upgrade, regardless of being past +6 upgrade or not. The numbers on GR, 70+16 Defense and 20% ranged reduction were:

+4: 36
+6: 39-43
+8: 40-50

This was after numerous trials of each when I ran 99 total Strength, while being naked otherwise.

[Souless_koji]

I dont realy think thats true, I was bord awile back and desided to make a SC pally, I saw a +6 stone bukler for sale quite cheap but I remebered the debate on anima about the refined damage, so I just made a wole bunch of over upped shield[0]'s if I remeber correctly I made from +4 to +9 and used a 99 pally with 99 dex and 99 str as the control and damaged porings with no gear. The results where minimal increases from +4 - +6 and not seeing any differance after +6 - +9, well after all that I desided not to buy the +6 stone bukler and got a +6 termaran carded shield[1] just for fun.

Just tested +4, +6 and +8 Guards. The Shield Chain damage range increased every time with upgrade, regardless of being past +6 upgrade or not. The numbers on GR, 70+16 Defense and 20% ranged reduction were:

+4: 36
+6: 39-43
+8: 40-50

This was after numerous trials of each when I ran 99 total Strength, while being naked otherwise.

Yea I just tested on ratemyserver test server and got about about the same increases, lol lethal damage