Long story short, don't rely on one piece of software to manage your security. No single app does everything well and they all have weak spots. The very best option is to educate yourself on how to generally secure things and what behaviors to carefully manage. This thread is a good start but a good night of googling will give you a much broader picture. I would also start with sites that talk about generic procedures, NOT sites that advocate a particular software as they are all agenda-/money-driven and will thus present a skewed picture. Get the basic ideas down and then figure out which tools cover those basics well.