@Ravi JI've got both one my two cars right now.
The IrisPro is great
The NDFOS was only put on a few days ago so it's a little too early to say but purely based on feel as an unscientific measure the IrisPro feels like it has a slight edge
Cost wise the NDFOS is marginally cheaper but comes with a 15 year warranty Vs 10 years for IrisPro