Armstrong has been an outright liar. His actions have been calculated purely for personal gain.
Guildford's actions, in the past, have been alcohol induced and he has tried to seek help for his problem. Time will tell if this latest incident is also alcohol-related.
Despite the differences in their falls from grace, let's not feel too sorry for them.
Years ago, Charles Barkley - a somewhat opinionated NBA basketball player - was criticised by fans and the media when he made the statement: "I am not a role model. Parents should be role models."
Some sports stars claim they never asked to be role models. Well, that's just tough. Their high profile, highly paid positions make them role models, whether they like it or not. Off-field antics rub off on impressionable youngsters who idolise their sports stars and makes our job as parents harder. Thank goodness there are plenty more well behaved sports stars for us to idolise.