Infernal Cinder 910:
1225 Crit
Specter of Betrayal 910:
2264 Agi
As you see Specter is way more heavy on the stats side, while Cinders value is more on the procc side.
It is natural that the cinder procc will beat out the specter procc. But that doesn't make specter a worse trinket, in fact it is better on the same ilvl, given non movement bosses.