Eh, the R-37Ms are still, as the others have said, capable of shooting down fighter sized targets at nearly the same range with one report of a Ukrainian Su-27 having been hit stating that it was fired at a distance of ~220km. The 37M, while optimised for HVTs, can hit a target maneuvering at 8G well past 250km according to its official data. Still, Gandiva is undoubtedly the super missile kinematically, due to the SDR giving it a massive NEZ (its effective range will not be 250km, it will likely be ~300 or more due to this fact) and insane energy + velocity at impact, but the R-37M does cut into its role partially. This is where my initial concern comes into play. Both missiles will be used to attack HVTs, and that's where my concern of the IAF possibly putting the order of the Gandiva on the back burner comes from should the 37M enter service, since the R-37M will force the opponent's aerial assets to fly even further out, thus making induction of the Gandiva slightly lower on the priority list (assuming the worst shines of the classic lethargic acquisition approach).