STS or DC for unholy pvp only

Hi there! I'm new playing 3.3.5 and actually play horde in blackrock pvp realm..
Because I'm horde I only can use 1 dmg trink and in the other slot the medallion. So my quest is which is best?
STS hc or DC hc for Soloq/2s/3s which does more dmg

Breaking it down logically;

Passive ARP vs Passive AP

In a PVP setting you're won't be hitting your target 24/7 in melee, so the value of the ARP goes down. While you can't help getting kited or CCed, the passive AP on DC HC remains helpful by making your diseases, DND and death coils hit a little harder.

1472 AP proc vs 510 STR proc

Also a must to mention that the 510 STR proc gets more gains through Blessing of Kings, your talents Ravenous Dead and Endless Winter, and your ghoul inherits your strength. According to wowhead (casual googling) its about 1 str : 2.7 ap, therefore we arrive at DC HC proc = ~1377 AP.

Now STS HC's 1472 AP obviously beats DC HC's 1377 AP, the difference is only ~95 AP during proc.

Considering the first point about passive 288 AP being more useful than 184 ARP.... I'd say the winner here is DC HC for arenas.

This is just my take, I hope its helpful, but please also do your own due diligence and research as well before committing to your choice of trinket.

@Icyheart
What do you think is the best second trinket for a human?
DC normal vs StS hc vs WFS hc
As UH DK with wandering plague talent.