By number of titles, Ramsden (3) after this week, Blanks's from XC is more prestigious.
In comparison to the best in the world, Blanks is ~25-30 seconds for a 5k away from being in the conversation for best in the world. Ramsden is 15 seconds for 1500 away from a similar mark. This would put Blanks closer to adjusting for event length (30s is 3.8% of 13:03 5k while 15s is 6.1% of 4:05 for 1500)
This is all kinda just hand waving, though. I think Ramsden is closer to a 4:00 or 3:59 athlete which would make her closer to world-class than Blanks.
Thoughts? I also think both athletes are incredible and don't want to appear to be diminishing either.