I don't know much about sound files, correct me if l'm wrong:
https://wiki.ubuntuusers.de/Opus
pros
— although same quality, smaller file size
— quality can be reduced further than in ogg vorbis → smaller file size
— maybe better file format for short sounds → smaller file size
— smaller file size → downloading sounds (part of Media) maybe faster
cons
— installing opus on old os may not work → envy, etc
— ogg vorbis maybe has hardware decoding support?
neutral
— ogg opus file names end with ".opus"
— ogg vorbis files support isn't dropped