In Japan, the correct story is that vtubers themselves are more likely to be a part of a breakthrough.
I'm sorry I can't give you specific numbers, but it's in the form of box fans who first recognize that "vtubers are on fire" when either Hololive or Niji-sanji is on fire, and then go around correcting that later.
The reason why Koro-san says "I'll try not to destroy your memories" when he plays retro games is because when he played Mother 2 before, he said on Twitter "Mother 2 was trending and I expected it to be a new game, but it was just some unknown V playing it, go fuck yourself! The reason I say this is because when I played Mother 2 before, my tweet "Mother 2 was trending on Twitter and I expected it to be a new game, but it was just some stranger playing V. Fuck you!
For this reason, the question "Which is more popular in Japan? is a very difficult question to answer. First of all, the premise is that the majority of people don't have an accurate grasp of who is where.
Light users are not aware of where the countless vtubers belong.
But at least until Coco Kiryu becomes popular in 2020, it's Niji-sanji. It's safe to say that they had the upper hand until last summer's Koshien. With the debut of the 5th season of Hololive and the appearance of EN, there is now a huge difference in "numbers".
Companies have started to ask for work from Hololive, which has more than one million users.
However, I can understand why such threads appear on 4channel.
The reason why these threads appear on 4chan is because men are clearly the strongest in Niji-sanji. If you only look at male vtubers, Nijiji is powerful.
Most of the other well-known male vtubers are known to have dual careers as manga artists, so they are naturally perceived as Nijiji.
Many of these "Niji-sanji male fans" are aggressive towards female vtubers, and in this day and age, male fans as well as fujoshi are loudly saying things like "women are flattering, so men are more interesting.
Therefore, in reality, in Japan, it is only those who watch the show, mainly men, who say that "the popularity of the Chronowa area and Kenmochi = the popularity of NijiSanji.
In addition to this, there is a part of Niji-sanji where the women are not as good and their popularity is decreasing.
Take a look at Matsuri and Yuuki Chihiro who had their first meeting at the Niji APEX tournament and decide which one is better.
Or Mito has started playing with four people called VWW. It's symbolic that he's having fun with the other members of the group except for Lizzy who adores him.
The others are APEX, who either expose their lack of academic ability or don't talk much.
Only Nui is supposed to be a talker, but he doesn't play games for foreign nikkies, so he might be a true example of "popular in Japan".