Generations of Sheffield football fans have been brought up to be one or the other - you’re either either blue and white or red and white.
But, for some players across the years, they have worn both sets of colours.
We look at those to have represented both clubs (since World War Two) and the select few to go directly from one club to the other.
In fact, only SIX players have ever crossed the divide directly and, amazingly, it has been one-way traffic with all those half-dozen transfers seeing players go from Hillsborough to Bramall Lane!
No player has actually gone the other way although Blades legend Jimmy Hagan almost did so after the Owls offered a record £32,500 in 1951. Hagan declined to go!
The first player to “cross the divide” straight from S6 to S2 was Jeff King in 1982.
Released by Wednesday, he had an unsuccessful trial at Hibs before joining United who he helped to the Fourth Division title
Shortly after King’s move, another Owl departed for the Blades.
Terry Curran, the temperamental but talented winger-turned-striker, moved across the city for a tribunal-set fee of £100,000 in July 1982.
In doing so, Curran became the first player to move between the two fierce rivals for a transfer fee. Even to this day, no other player has matched that unique statistic.
After the controversy of Curran’s move, it would be seven years until the two clubs did business again.
In September 1989, Wilf Rostron had only been with the Owls for eight months before he was loaned to Dave Bassett’s Blades and he joined them permanently in November that year.
As the 1990’s came into focus, the rivalry and intensity between the two clubs grew as they battled together in the top flight and the two were, understandably, reluctant to do dealings.
The next time a player would swap clubs would be when Owen Morrison left Hillsborough on a free to be snapped up by Neil Warnock in February 2003. The little wide player failed to make any lasting impression before before released just six months later.
The most recent players to switch from Wednesday to United were Leigh Bromby and Alan Quinn (the only player to score for both clubs in a derby). The duo were released by the Owls at the end of the 2003-04 season and Warnock snapped them up.
Derek Geary made the same journey but played for Stockport in between.
The list: Earl Barrett, Danny Batth, Carl Bradshaw, Leigh Bromby, Franz Carr, Richard Cresswell, Terry Curran, David Ford, Derek Geary, David Johnson, Jeff King, Brian Marwood, Chris Marsden, Jon-Paul McGovern, Owen Morrison, Alan Quinn, Neil Ramsbottom, Walter Rickett, Carl Robinson, Wilf Rostron, Bernard Shaw, Simon Stainrod, Imre Varadi, Alan Warboys, Dean Windass.