Which crash created the most debris?
"A leading space scientist has calculated that Tuesday's
collision between an Iridium communications satellite and the defunct Soviet-era Cosmos 2251 spacecraft expended a great deal more destructive energy than China's infamous
anti-satellite missile test did in January 2007."
http://www.newscientist.com/article/...asat-test.html
S&T says the Chinese test is worse.
"Let's not forget that on January 11, 2007, the People's Republic of China launched a ballistic weapon that struck and destroyed Fengyun 1. The resulting fragments created more space shards than any other event in the history of satellite exploration, creating a hazardous cloud at altitudes ranging from 300 to 2,500 miles."
http://www.skyandtelescope.com/news/39551797.html