It's already said but I think tournament success is the real barometer. Total winning percentage is kind of a joke when you compare the OOC schedules, and they really haven't been close in the past 10 years.
I must be missing something obvious in those stats you've posted, but I'm gonna copy and paste what's written on wikipedia for his success... Can you honestly say that Tubby's had anywhere close to as much success as Izzo's had in the past 10 years??
Accomplishments and honors
Championships
One NCAA Division I Championship: (2000)
Six Regional Championships - Final Four: (1999, 2000, 2001, 2005, 2009, 2010)
Six Big Ten Championship: (1998, 1999, 2000, 2001, 2009, 2010)
Two Big Ten Tournament Championship: (1999, 2000)
Accomplishments
Two NCAA Championship Games: (2000, 2009)
Seven Elite Eight: (1999, 2000, 2001, 2003, 2005, 2009, 2010)
Nine Sweet 16: (1998, 1999, 2000, 2001, 2003, 2005, 2008, 2009, 2010)
Fourteen NCAA Tournament Bids: (1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011)
Awards
Associated Press National Coach of the Year (1998)
Henry Iba Award (1998)
Big Ten Coach of the Year (1998, 2009)
Don't look much different to me ...
Overall Record
Tom Izzo: 235-108 (.685)
Tubby Smith: 233-103 (.693)
Conference Record
Tom Izzo: 111-57 (.661)
Tubby Smith: 103-65 (.613)
Conf. Reg Season Champs: Izzo-2, Smith-2
Conf. Tournament Champs: Izzo-0, Smith-2
Champions: Izzo-0, Smith-0
Runner-Up: Izzo-1, Smith-0
Final Four: Izzo-2, Smith-0
Elite 8: Izzo-1, Smith-2
Sweet 16: Izzo-1, Smith-1
2nd Round: Izzo-1, Smith-3
1st Round: Izzo-4, Smith-2
NIT: Izzo-0, Smith-1
Nothing: Izzo-0, Smith-1