Kanu Nwankwo is Nigeria's most decorated player in history as he won English and Dutch league titles, FA Cups , the champions League and Olympic gold medals with Ajax, Inter Milan, Arsenal and Nigeria but didn't win the Nations Cup trophy with Nigeria.
Mikel on the other hand has won UEFA champions league, UEFA Europa league, FA Cup, Community shield, premier League trophy, Nations cup but hasn't won Olympic gold with Nigeria.
Many football analysts and sports enthusiasts believe Mikel will edge out Kanu Nwankwo if he finally gets his hands on Olympic Gold this summer although Kanu has a greater number of team trophies/accolades.
Mikel Obi's awards/ titles won:
Chelsea;
Premier League (2): 2009–10, 2014–15
FA Cup (4): 2006–07, 2008–09, 2009–10, 2011–12
League Cup (2): 2006–07, 2014-15
FA Community Shield (1): 2009
UEFA Champions League (1): 2011–12
UEFA Europa League (1): 2012–13
Nigeria;
Africa Cup of Nations (1): 2013
Individual;
U-20 World Cup Silver football 2005
African Young Player of the Year: 2005, 2006
Chelsea Young Player of the Year: 2007, 2008
Kanu Nwankwo's awards/ titles won:
Iwuanyanwu Nationale;
Nigerian Premier League: 1992–93
Ajax
Eredivisie: 1993–94, 1994–95, 1995–96
UEFA Champions League: 1995
UEFA Super Cup: 1995
Intercontinental Cup: 1995
Inter Milan
UEFA Cup: 1998
Arsenal
Premier League: 2001–02, 2003–04
FA Cup: 2002, 2003
FA Community Shield: 1999
Portsmouth
FA Cup: 2008
Nigeria;
FIFA U-17 World Cup: 1993
Olympic Gold Medal: 1996
Afro-Asian Cup of Nations: 1995
2000 African Cup of Nations: Runners-up
Individual;
African Footballer of the Year: 1996, 1999
BBC African Footballer of the Year: 1997, 1999