I do not think a direct comparison between TTA and DCP is fair. As you know, TTA is a compound in DCP. TTA is known to cause cramps in some individuals. For precisely this reason, DCP contains Potassium Pyruvate, an advanced potassium form, to neutralize this cramping effect.
In terms of endurance, I can postulate at least one pathway through which DCP can produce an enhancement in endurance levels. DCP contains Priopionyl-L-Carnitine. Propionyl-l-carnitine has a special affinity for heart, endothelial, and muscle cells. It quickly penetrates these tissues and delivers benefits ranging from the protection of heart muscles to neutralizing fatigue via elevation of muscle glycogen stores. This is important. Furthermore, the potassium in DCP may help to stabilize electrolyte levels in the body, leading to performance enhancement. Something else: The bonding of potassium to pyruvate may also contribute to energy metabolism. As you recall, pyruvate is an intermediate of the Krebs-Cycle, a crucial component of energy metabolism.