EW is the highest point for me. I've had more playtime since Endwalker than my time spent in ARR in 2014 through Shadowbringers combined.

Shadowbringers did have a comparable quality story, but overall I really enjoyed the end of EW and the post-patch story and feel.

Lowest point of XIV for me was the release of Stormblood. Quit at level 63 for 2 years out of the story boring me to death.