this is such a tough question. i guess - cards on the table - i've only been a wrestling fan for a little over 10 years. the history of pro wrestling goes back centuries and i am certainly not an authority on the full breadth and depth of it. i don't even have the shared baseline of watching wrestling as a kid in the 90s like a lot of fans my age do.
anyway, you didn't ask about my fandom imposter syndrome.
if i had to pick, i have a very special place in my heart for late aughts and 2010s SHIMMER. Stephanie McMahon may have taken credit for the WWE Divas Revolution, but that shit started in SHIMMER. they had a murderers' row of wrestlers coming through the Berwyn Eagles Hall back then, including some of the biggest women wrestlers working today. SHIMMER was the first place i saw Dakota Kai (fka Evie), Asuka (fka Kana), Athena (fka Ember Moon, fka... Athena), Mia Yim, Mercedes Martinez, Hikaru Shida, Saraya (fka Paige, fka Britani Knight), Sara del Rey, the list goes on. it helped expose me to a side of wrestling i hadn't seen in WWE and got me to branch out into other indies and the Japanese scene.
sadly, i don't think they've run any shows since the pandemic and i don't know if they have any plans to start up again. it's too bad that i never got down to Berwyn to see them live. it was a very special promotion for a while though and they've got a pretty good catalog on Youtube, so i highly recommend folks check them out!
thanks for the ask!