Eternal Bow vs. Storm Bow

Alright, so here's the situation, we have these two...

(1)
Vampiric Storm Bow
max piercing, req 11
+14% in stance
5/-1

(2)
Vampiric Eternal Bow of Enchanting
max piercing, req 9
12^50
3/-1
Enchanting 15%

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So here's the question... would puttinng the 5/-1 on the Eternal Bow make it worth more, or is it worth more on the Storm Bow.

Trying to figure out which is a "better" skin Eternal or Storm.

putting the 5/-1 on wont make any difference

prob get 10-15k for both