Here is a dream team of players who have represented both clubs - as well as a head coach.
The Welsh international spent three years at Wigan before the Super League era and moved to Saints after a season at Oldham. Son of Kiwi great Graeme, the Wigan academy-graduate played twice for the club but had more success at Saints, including his part in the famous 'Wide to West' try. The Kiwi joined Saints in 1999, more than a decade after first coming to these shores with Wigan. Emerged on the scene at Saints as a 17-year-old and had huge success with Wigan after a stint in Australia... earning him the nickname 'Judas' among fans in his hometown. Mainly a centre but moved to the wing for this side, he starred at Saints and later won the 2010 Grand Final with his hometown club. Played 12 matches for hometown club Wigan but cast a legacy across Billinge Hill... after a trade with Widnes for Lee Hansen. Broke into the pro ranks with Wigan, this well-traveled halfback led Saints during their successful inaugural Super League campaign. Like Connolly, he had success at Saints before moving to Wigan and later had a stint Down Under with Auckland Warriors Made a bizarre move from St Helens to Wigan - via Bradford - and later gave good service to Warrington and hometown club Leigh. The Aussie front-rower had a season at both clubs, joining Saints in '98 before a move to the Warriors. The current Wigan forward came through the ranks at St Helens before a short stint in the NRL with Gold Coast Titans. Picture: SWPix Emerged from the Wigan academy but left at the end of 2006 and spent four years at Saints, before ending his career with Bradford. Struggled for game-time in 2009 at Wigan but had more success at Saints after two years in the NRL with Wests Tigers. Played four matches for Wigan during a troubled 2006 campaign, having previously played at St Helens and Salford. The prop won the Challenge Cup with both clubs - with Wigan in 2002 and Saints two years later. He became known as the 'drop-goal king' with 20 successes, including two when Saints defeated his old club Wigan in the Premiership Final at Old Trafford in 1993 The half-back, who finished this year on loan from Catalans at Warrington, had two stints with Saints either side of five years with the Warriors. 'Basil' brought success to St Helens but failed to make his mark at Wigan, and was in charge for the 75-0 loss at his old club.