Naked self-interest disclaimer: I want the best config for the --output option, one that sorts downloads into folders, respects playlist order etc., and never ever displays the string NA, no matter which extractor is used (I mostly use youtube and bandcamp).

edit: here's my own:

-S res:720  
--embed-metadata  
--embed-thumbnail  

# maybe that'll speed things up  
--concurrent-fragments 3  
--buffer-size 16k  
#  

--output "%(channel,playlist_channel,uploader,creator)s/%(playlist)s/%(playlist_index,playlist_autonumber,video_autonumber,autonumber)03d %(display_id,title,id)s (%(duration_string|_)s).%(ext)s"  

--sleep-subtitles 1  
--sub-langs "en.*,de.*,fi.*"  
--embed-subs  

Any suggestions on improving --output...