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I get that it's just bait, but there are a bunch of streams where hologirls get under 8-10k concurrent viewers with double the subs compared to Sanbaka's or Honhima's 10-14k streams. It really just depends on the context.
Nijisanji is, as we all know, more Japan-oriented and the Japanese clips are far more frequent and get equal or more views than Hololive eng subbed counterparts.
Niji just recently started trying to get into the eng market, but despite of this they are not forcing their talents to pander the eng audience.
Tl;dr subscriber base and number difference. Performace ratio view/sub similar, dependant on a case to case basis in both groups.