I followed it a bit, and I followed the one that preceded it in England. Oddly, some evidence that was allowed in England wasn’t allowed in the US, and some evidence allowed in the US wasn’t allowed in England, so a lot of opinions are different based on which trial they paid more attention to.
Basically, they’re both awful people who were regularly blackout drunk/high, and had a mutually abusive, toxic relationship. A lot of the arguing online is about who was the mostest abusive/toxic, partly (imo) based on the parasocial relationship they have with their celebrity of choice and who had the best zingers in court. In the US trial, Johnny Depp was charming in court and had GREAT lawyers, and Amber Heard came across as very fake (like she was performing for the jury) with terrible lawyers. In the England version, Johnny Depp admitted he didn’t remember what he did or didn’t do to her because he was really high and drunk a lot. They both have witnesses with pretty convincing stories. There was also a lot of fighting about who pushed whom down the stairs, who hit whom, who cut whom with a bottle, etc.
TL;DR - They’re both emotionally unstable trash and would be AWFUL to date. You didn’t miss much.