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Nijisanji get's a lot of shit on this board, but let me just say this, there is not false advertising on their parts when it comes to their talents. You dive in expecting to find girls and guys having fun and playing games and that is exactly what you get.
Hololive on the other hand started with an idol gimmick on top of trying to be like Niji, then they dialed back their male interactions (even at the expense of their male JP branch that people still call "Yagoo's pet project"), until they changed their minds, AGAIN and pushed for "talent freedom" in their own way, and the freedom to interact with whoever they want, and lately pushing for the FPS slop that most of their fans hate, just to pander to a certain market.
So Holo in a nutshell is a peak soulless moneygrabbing corpo that just goes for FOTM trends while Niji is basically "we just do our own thing" and that was always like that without any major deviations.