@houstonpolice NCAA data (limited to 2000-last season) shows this:
Southern's per game average attendance was better than Jackson State's in 2000, 2003, 2004, 2005, 2007, 2012, 2013, 2014, 2015 and 2017.
Jackson's per game average attendance was better than Southern's in 2001, 2002, 2006, 2008, 2009, 2010, 2011, 2016 and 2018.
So that's 10 seasons for Southern and nine seasons for Jackson State. It's pretty much neck and neck.
Jackson was the last D-1 HBCU to average 20K/home game in 2018. Before that, Southern averaged 20k/game in 2013.
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I think the data shows that the schools both have great fanbases that weathered bad coaching eras and attendance rose as the teams grew more competitive.