Rebirth! I only have read that and parts of New 52 so definitely Rebirth!
For me, its the Silver and Bronze Ages. The Silver Age showcases some of the greatest artists in the medium’s history. The Bronze features good artwork, but the writing reaches new levels thanks to likes of Wein, Wolfman, Bates, Maggin,
Robbins, and the great Denny O’Neill. Two decades of wonderful comic books that stand the test of time.
I really love from Crisis on Infinite Earths through 52. I know it is twenty years plus, It just seemed like an extraordinary time.