What is the best Bionicle set?

LEGO BIONICLE
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2001: Toa Tahu
2002: Boxor
2003 Toa Takanuva
2004 Toa Matau
2005 Toa Iruni
2006 Toa Jaller
2007 Toa Mahri Jaller
2008 Antroz
2009 Mata Nui
2010 Toa Tahu

The Best of Bionicle 2015 (what to buy of the new wave)