i'm just curious because on ao3, the difference between the two ships in fanfiction is 296, as of i am writing this—with tsukiyama leading.
though, since there are an average of ~16 new haikyuu fanfics written per day (and an average of ~21 updated fics per day on ao3,) this is actually not much of a big gap.
however, yesterday 23/2, there was 27 new/updated sakuatsu fanfiction. while tsukiyama only had 12 fics, all of them were mostly updates.
btw my counting of 27 & 12 may not be 100% accurate, more like 85% accurate.