BTS will top both charts, if theyre being fair.
UWC takes both sales and streams into account and BTS has top 2 albums of 2020.
Even on Spotify the difference between After Hours and MOTS7 is 1.7 billion streams, which is 1.1 million album units using RIAA ratio. And MOTS7 has sold 4.4 million physical albums, that more than makes up the gap.