The main differences in their characteristics and uses are –

 

Portland Pozzolana Cement (PPC) is a variation of Ordinary Portland Cement. Pozzolana materials namely fly ash, volcanic ash are added to the OPC so that it becomes PPC. Pozzolana materials are added to the cement in the ratio of 10% to 25% by weight.

Both are ecofriendly materials but Pozzolana Cement uses natural and industrial waste thus reducing the environmental pollution.

OPC	PPC
It has higher strength than PPC in the initial stage.	The strength of PPC is good than OPC in long terms.
It has high heat of hydration making it unfavorable for mass concreting.	The hydration process is slower than OPC resulting low heat of hydration. Therefore, it is suitable for mass concreting.
The presence of sulphates, alkalies, chlorides, etc. is higher and less resistant than PPC.	It has low percentage of sulphate alkalis, chlorides, magnesia and free lime in its composition, which makes the concrete durable.
OPC is not favorable in aggressive weather.	Show greater resistance to aggressive weather.
OPC cement are available in three grades, such as 33 Grade, 43 Grade, 53 Grade	PPC is available in any specific grades.
It is slightly costlier than PPC.	Cheaper than OPC.

Conclusion: Both OPC and PPC are commonly used cements in construction. These days, PPC is used as a substitute of OPC. PPC is a variation of OPC which adds a mixture of a pozzolanic material that helps to enhance the strength of the concrete. PPC also brings down the amount of OPC requirement in making concrete. Interestingly, it is a green material that contribute towards sustainable development. Considering these factors, PPC has a slight edge over OPC. However, it is difficult to come to a definite conclusion.