Probably the 2015 ball line up.
Editing this post to include any updates for easier use and comparisons.
May 2016 lineup:
http://radicalbowling.com/uploads/downloads/Ball_Comparision_Chart_May_2016.pdf
Sept 2016 lineup:
http://radicalbowling.com/uploads/downloads/Radical_Ball_Comparision_Chart_Sept_2016.pdf
Jan 2017 lineup:
http://radicalbowling.com/uploads/downloads/Radical_Ball_Comparision_Chart_Jan_2017.pdf
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