My alma mater team did an analysis of the difference between using belts and chain back in '08. Here is the link:
http://cyberblue234.com/site/wp-cont...CHP_Forum1.pdf
That being said, we used belting for our drive system at one regional. We accidentally got some WD-40 on them, and they were shredded the first time heavy defense occurred. Otherwise, they worked great.