Meteor is cool but I think there's a reason why both China and the US abandoned ramjet powered AAMs. Both would have experimented with those ... I mean China operate several ramjet powered anti-ship missiles but striking a moving ship and striking a moving fighter aircraft are very different things and the optimal flight profile of the missile and energy at intercept for these different targets would indicate that conventional missiles are better. Dual pulse compensates for the extended range that ramjet powered missiles offer.
Think about it this way, it's a balance between the energy density of the rocket fuel in a dual pulse arrangement vs the energy density of kerosene/jet fuel in a ramjet. Both run out of propellant eventually. One reaches further but with a slower, sustained speed (Meteor) while the other boosts to above mach 4 (provided supersonic launch speed) reaches the target sooner (PL-15). At similarly extended ranges, the PL-15 would possibly have a slower intercept speed than the Meteor - probably mach 1 vs mach 2 but the PL-15 has reached its target intercept point and reached it much faster. The average speed of that flight profile if it's under lets say roughly 100km - 150km would favour the PL-15. Beyond that range, the energy probably shifts towards ramjet. Issue is response time and average velocity.
The new PLs (longer ranged than the PL-15) are all rocket powered. The AIM-260 is dual pulse rocket powered similar to the PL-15. The AIM-174 is obviously rocket powered SAM conversion. Both these military giants put more stock into rocket powered AAMs for their latest and longest reaching AAMs. Both would have been experimenting with ramjet powered AAMs for at least 2 decades now and would have had ramjet powering their AIM-260 and PL-15 if ramjet was a better way to go. Well at least for AIM-260. PL-15 was developed a long time ago.