Here are all SCORUGGERS! in Women's English Top-Flight Rugby Union by club, which shows that the most unique club is:

SARACENS WOMEN!

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Please note: This list covers women's English top-flight rugby from the Premier 15s era. It is not our intention to imply that the equivalent competitions that preceded the Premier 15s should be ignored. Instead, these earlier competitions are currently omitted from our records because we have not yet been able to find complete records of match scores pre-Premier-15s. We are working towards comprehensive coverage of the history of women's English top-flight rugby.