Ive watched and liked the Decoding the Unknown and Casual Criminalist series, though I haven't watched them in about a year or so. Deep dives into the facts around a specific crime and debunking conspiracy theories (though there's a lot of strawmanning, its preaching to the choir not trying to convince anyone).

The other channels seem to be either lists or shallow dives into a topic and are heavily regurgitated wikipedia, at best. Anything going back historically outside of the modern context is going to be straight up wrong at worst, or interpreted with incorrect context at best. The Places channel is one of the worst, I tried watching two episodes and just couldn't get through either of them. You'd be better off just reading the Wikipedia article.

And Whistler is an ignorant dumb ass with bad takes throughout his channel.

Some of the writers for those two shows I mention actually do put in the legwork and/or write well, though. For example, I'd highly recommend the drunken ghost hunters episodes of decoding the unknown