Which cement is best for concrete slab construction? OPC or PPC?

OPC is the basic form of cement with 95% cement clinkers and 5% being gypsum. it gains early strength recommended for Structural Concrete or Reinforced Concrete Works (like Columns, Beams, Slab etc.,)

PPC is made up of 75 – 77% cement clinker, 20% fly ash and 3-5% gypsum, it can be use for brick masonry, plastering, tiling and waterproofing works.
 
Opc includes 95 % cement clincker and only 5% gypsum.ultimately have good strength.But Ppc comea with only 75-77% clinker and 20% flyash and upto 5% gypsum.So it's environmental friendly and also have good strength.for strength criteria i.e. for Rcc work OPC should be used and for brickwork, plaster and any other work,where strength criteria is not important,PPc must be used .