Great article! It’s about time these apps start getting some notice in the photography press!
I have Nitro open on one desktop in macOS Spaces. When I finish editing a raw photo and export a JPEG to a subfolder, I swipe right to the next desktop in macOS Spaces and view the JPEG in ApolloOne. I often target multiple subfolders and ApolloOne lets me view them all to compare different approaches I may have used on each raw file.