I like a traditional, value-centric debate. The clash of value / criterion is critical, and supporting contentions should be clearly linked. I do not mind unique approaches to the topics, but I prefer the focus to reaming on the value clash and ability to show its influence on the contentions and evidence chosen. Extended analysis can include social impact, both pro and con.

Cooper's Paradigm -

To be able to judge a round, competitors must speak loud and slow enough for me to understand their arguments. Arguments should be supported by evidence along with sound reasoning. Dropped points do not necessarily win a round.