Joel compares Luminar 2018, Topaz Studio, On1 Photo Raw 2018 and Lightroom Classic CC. He is using latest updates of each. He is using Fuji files and Mac computers and this is a very comprehensive summary.
The comments were the typical moronic sort, mostly. Lots of people griping that he didn’t cover Capture One. Presumably if he had included it and slagged it off they would also have been angry. If they are so convinced what is right you wonder why they bother even reading a review.