Eureka is far better for relic creation because whatever you're grinding for, you always get what you need, every single fight counts. Back in Stormblood, Square was still kissing up to us to rebuild FFXIV's reputation after the 1.0 disaster, but now that they've beaten World of Warcraft, and squandered that lead in every possible way, probably falling back to second place at this point, they no longer feel generous or apologetic. The current grind feels sadistic, masochistic, and like the worst kind of waste of your time and money.
I’m getting by though at this point, switching between fate grinding and the OC. Got two more demiatmas doing fates today (my first ever from fates).