I've used Open Subtitles for many years and I still don't know how to choose among a large set of subtitles, all targeted at the same video.
I can, of course use the checkmarks for a trusted encoder as well as the icon which shows that it may include subtitles for the hearing impaired. The names of the subtitle files typically have a lot of cryptic information appended. Should I be trying to make sense out of that information? Most usually, I just pick one and see if I can make it work, even if it means doing some timing adjustments. There must be a better approach.