Difference between my Passport and my passport essential

If the WD My Passport is the newer of the two, why is WD My Passport mentioned back in 2010?  I just bought the WD My Passport 750gb and after galloping home, I saw in the same flyer the WD My Passport Essential 1TB for the same exact price.

I’m here having pulled out two hairs and wondering should I stay with what you say is the new(er) model or should I rip back in and switch to the WD My Password Essential.

The size 750 gb or the 1TB really is not the issue. I’m wondering which really is the newer model of the two. Please reply before I rip out another hair!