GOBLIN BUILD

You need 146 INT to use DD25 helm and FP+8 gloves/boots in that build in Knight. So you save 12 HP points which also gives u extra 12AC if ur HP more than 100.

Goblin FP Pauldron
AC: 92
HP: 10
Hit Points: 50
FR, LR, IR : 16 each
Goblin FP Pad
AC: 76
STR: 10
Hit Points: 50
FR, LR, IR : 16 each
Total Bonus (counted with bonuses from items and extra stat points)
AC: 180
STR: 10
HP: 22
Hit Points: 50
Fire Resist: 32
Lightning Resist: 32
Ice Resist: 32

+8/15HP FP BUILD

You need 158 INT to use +8 Pauldron in that build. Of course can use DD25 helm and FP+8 gloves/boots. So u need put extra 12 points in INT which gives u some mana and 6 to all resists (every 2 int points over 100 gives 1 resist point)

FP+8 Pauldron
AC: 111
HP: 15
FP+8 Pad
AC: 95
HP: 15
Total Bonus (counted with bonuses from items and extra stat points)
AC: 206
STR: 0
HP: 30
Hit Points: 0
Fire Resist: 6
Lightning Resist: 6
Ice Resist: 6

Comparision

So difrence is not so big. The strong thing in gob are resists and stat bonus. +8 set is more defence. Stat bonus - yup, goblin gives more - 22HP and 10STR so 32 to stats vs 30 from +8 set.

Lets see numbers again:
FP+8 - 26 more AC, 26 less all resists, 50 less hit points, 2 less stat points
Goblin FP - 26 less AC, 26 more all resists, extra 50 hit points, 2 more stat points

or other way:
FP+8 = 26 ac, 8HP vs GOB FP = 10STR, 50 hit points, 26 FR, 26 LR, 26 IR

You can always reduce ur extra 10 str points from goblin build in other part of armor or in base stats, so basicaly goblin gives more HP for BP but support fp will have less HP since he dont need str and got str in stats only for shield.

Note: I wanna recommed you buy the cheapest Knight gold andKnight powerleveling, Knight bronze for strengthening the power of you chracters. Just have a try! ^^

Conclusion
I think choosing betwen these 2 builds is hard and depens on accesory u have and type of priest u want to be. If u got many resists and u r 174/178 str build and rest in hp, go +8. If u use mix of str and hp armors + need some resists - go goblin.

For me i found the best is lot of stat points in hp for extra def and goblin/str armors for resists and ap.

It is much better than goin 220+ str and hp armors like many ppl do, coz u not losing bonuses from extra defence gained for every HP point over 100. But main problem here it is very hind find +8 and +9 fp/chitin with STR bonus.

Source.