With figures gathered from Transfermarkt, here's a look at how both club's average home support over the last decade...
13. 2015/16 - Sheffield Wednesday
Division: Championship. Average home attendance: 22,646. (Photo by Matthew Lewis/Getty Images) Photo: Matthew Lewis
14. 2015/16 - Sheffield United
Division: League One. Average home attendance: 19,808. (Photo by Jan Kruger/Getty Images) Photo: Jan Kruger
15. 2016/17 - Sheffield United
Division: League One. Average home attendance: 21,892. (Photo by Pete Norton/Getty Images) Photo: Pete Norton
16. 2016/17 - Sheffield Wednesday
Division: Championship. Average home attendance: 27,192. (Photo by Nathan Stirk/Getty Images) Photo: Nathan Stirk