Supposedly the success rate for Russian launchs between 1980-1999 is around 94% while the success rate for american launches is around 86%. Russians are more experience having launched 2589 times with 181 losses while Americans launched 1152 times with 164 losses. Now that the shuttles have been retired I'm going to assume the Russians will be really far ahead but maybe it's better that way with globalization right? As much as I like spaceX I find their newer untested technology not really viable for manned flight. They can't be trusted to carry anything other then low cost cargo until they've worked out their problems.