GRA
Well-known member
Although they aren't side-by-side comparos, I find the reviews at Plugincars.com to be objective, stating both good and bad points. The only downside is that they are often out of date, being done when the cars were introduced and typically not updated to reflect later model years:
http://www.plugincars.com/cars" onclick="window.open(this.href);return false;
http://www.plugincars.com/cars" onclick="window.open(this.href);return false;