I found this chart showing the top eight fighting games in sales and was rather surprised by Street Fighter's position.
* Tekken (number 3) has only 7 main entries (with an eighth one upcoming) and used to be PlayStation exclusive up until the ''5th game''. The first game released on consoles in 95.
* Super Smash Bros (number 2) has only four main entries and is still a Nintendo exclusive.
* Mortal Kombat (number 1) is extremely controversial due to its violent content and was the subject of a particularly infamous campaign regarding censorship in games during the 90s. There's also its history of being banned in certain countries. Up until 2015, every MK game was banned in Germany. MK9 is banned in South Korea and was banned in Australia until 2023. MK11 is banned in Indonesia, Japan, Mainland China and Ukraine.