Advice needed for spark plugs replacement (2006 Sentra)

If the car came with Iridium plugs from factory, then replace with Iridium. If the car came with Platinum plugs from factory then replace with Platinum. If the car came with standard nickel coated plugs, then replace with them.

NGK is the OEM provider Nissan. I think Denso might be also be. I would be surprised if your owners manual doesn’t spell out exactly what the NGK or Denso plug number is.