Thats not how it works, you dont get a second trinket for free. You lose 153 resiliance (passive on pvp trinket) and the advantages of the racial of whatever race you picked. Now, because the trinkets you usually wear have a higher ilvl then the pvp trinket you usually gain a few secondary stats, but not in a very meaningfull way (since the lost resiliance has to be gemmed for elsewhere, non humans can just gem a bunch of secondary stats or use more pve items).
The question is if the racial you gain is better then the proc/onuse of the trinket + the few lost stats. Mostly the answer is no, but for example Meld, belf silence for rets, WOTF for healers etc are all really strong racials. But in general the human racial does pull ahead.