Somewhere in this site is a discussion regarding planes with all-swoopy lines vs. planes with lots of rule-straight lines. The consensus can be boiled down to:
Curvists: "Swoopy curves make your flight look better by hiding all those little unavoidable errors. They make your whole flight look smooth. Lots of straight lines magnify them and reduce your flight score."
Straightists: "Rule-straight lines enhance all the straight lines in your pattern, and really make them pop for the judges. This makes your whole flight look more precise. Swoopy curves mush everything together and reduce your flight score."
For a visual summary, place pictures of Dick Mathis's "Chizzler" and Bob Hunt's "Genesis" together, and meditate upon them.