-godaddy customers may be victims of theft because it's the largest but still security could be much better and they often refuse to help with the recovery once domains have been stolen from your account.
-imo enom could do so much to improve their own security and some threads i've read show enom as unwilling to help domainers and they end up losing their names. we all believe the worst about moniker when someone posts a negative experience with them and moniker sure deserves this. but enom has come down from its position as one of the more secure registrars, no question.