E-mail VS Traditional Mail, Which is Your Choice and Why?

With the development of the Internet, E-mail has become more and more popular and most people will spend much time on receiving and sending E-mails. Yes, E-mail has matured and gained popularity, however, according to some specialists, the popularity of E-mail doesn't necessarily mean that it completely beats out postal mail. In their eyes, traditional mails are more secure than E-mails. From where I stand, traditional mails have been out of date and E-mails will become the trend of communication sonner or later. So, what's your opinion about it? If you have to make a choice between E-mail and traditional mail, what is your choice? Are E-mails less secure than the traditional mails? Thanks for your reply!