The Meaty Dragonspire Trophy is the best of the three. The other two are probably really close, but I'd pick the Humming Blackiron Trigger. The blackhand trinkets are really well budgeted for their ilvl.
for bm 99% of the time when it comes to items its ilvl or bust, in this case you are going to get more agility and stats by using both 685 trinkets. Case is closed