Id say Live does have more online players. But imo there is a limit to what can be definied as busy. Like there were 70 thousand players on PS3 COD W@W earlier, so when youre only in contact with 30 of those at a time its impossible to notice anything different, like when Im online I cant actually tell what busy is, I notice lack of but this hasnt happened to any current games as of yet on the PS3, the userbase is quite large.