Here are the GDP growth rates of India.

BJP Government

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1999 - 8.8%

2000 - 3.8% (Dotcom bubble busts)

2001 - 4.8%

2002 - 3.8%

2003 - 7.9%

Average GDP growth during BJP government - 5.82%

Congress government

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2004 - 7.9%

2005 - 9.3%

2006 - 9.3%

2007 - 9.8%

2008 - 3.9% (Recession hits)

2009 - 8.5% (Congress is re-elected for another 5 years)

2010 - 10.3%

2011 - 6.6%

2012 - 4.7%

2013 - 4.8%

Average GDP growth during Congress government - 7.51%

Considering that Narendra Modi has frequently pushed the GDP growth he achieved as the Chief Minister of Gujarat in his election campaigns, I think it is fair to recognise that on a whole, that atleast in terms of GDP, Congress did much better than BJP.

(I voted for neither BJP or Congress, so I'm unbiased on this)