The plain truth is that there's no real way of telling who's the best and who's the worst in the USA concerning policing. The FBI is supposed to be tracking all violent acts from cops, but they have refused to do it.
READ HERE:
https://www.theguardian.com/us-news/2021/may/17/fbi-police-use-of-force-data-records
I lived in LA (Santa Monica & Hollywood) for a decade throughout the 1990's
It was bad, real bad.
After moving from LA to the Balt/DC area, I worked as a journalist, often covering the culture and trends of police misconduct.
Firstly, consent decrees outlined by the DOJ are suggestive and have no prosecutorial power, unless shit is so bad that the DOJ investigates and passes of the case to the FBI to press charges. One example is the Baltimore Gun Trace Task Force prosecutions that have now led to 30+ cops being sentenced to prison for up to 25 years. You'd think, 'Wow, that's quite an accomplishment' but the ugly truth is that the States Attorney's Office (SAO) Marilyn Mosby had announced that they needed the FBI to stop prosecuting Baltimore cops because there were likely more than 100 more cops that could go down and it would certainly bankrupt the city with lawsuits.
To answer your question of 'Now what?'
There needs to be more pressure on the FBI to both investigate all incidents, and be transparent.
Supposedly Obama didn't want his 'personal bias' to be a factor in his admin, so he put Joe Biden in charge of responding to the uprisings 10 years ago. The 21st Century Task Force On Policing was a joke that had no plan of implementing 'suggested changes' of police reform.
Granted times nowadays of economic disparity fueled by the pandemic hasn't made it any easier for cops in America, the job can't be easy by any stretch of the imagination. I personally don't see anyone at the federal level that will initiate effective change. Yet, on the local levels some districts are making an effort.
If I were to vote on the worst, I'd put my money on Baltimore.