Which is better, automatic or manual switch?

I was wondering which type of e-cigs are better, automatic or manual switch? I have the Dura right now and so far it is working great, but is the Dura-C that much better? Sure the manual switch will provide long battery life, but I don't want to be paranoid every time I put my e cig in my pocket thinking that the button would be pressed accidentally and eventually draining the power. So I would like other vapers' opinions about this.