Average crowd: Middlesbrough: 24,409 (3rd highest), Brighton: 25,583 (2nd)
Years spent in top flight: Middlesbrough: 60, Brighton: 4
Biggest transfer fee spent: Middlesbrough: £12.8million (Afonso Alves from SC Heerenveen), Brighton: £2.6million (Anthony Knockaert from Standard Liege)
Middlesbrough: Now something approaching a figure of ridicule, it should not be forgotten that Steve McClaren took Middlesbrough to a European Cup final in 2006. They lost to Sevilla, with a team packed full of established internationals such as Stuart Downing, Mark Viduka and Jimmy Floyd Hasselbaink. McClaren also helped to deliver the club’s one and only trophy in 2004, when goals from Joseph-Désiré Job and Boudewijn Zenden saw off Bolton 2-1 at the Millennium Stadium.
Brighton: Brighton’s most successful period was during the early eighties, when the club played in the First Division. Led by Jimmy Melia, a team featuring the likes of Chris Ramsey and Tony Grealish made it to the 1983 FA Cup final, taking Manchester United to a replay, which they eventually lost 4-0. In recent years the opening of the 30,750 capacity Falmer Stadium has been a highlight, with the club twice since making it into the Championship play-offs.
Source : http://www.telegraph.co.uk/football/2016/05/06/middlesbrough-vs-brighton-championship-promotion-decider-live/