I can't say for certain if they have better security or not, but in general IE works well if you disable SSL 2.0 and 3.0, enable TLS 1.0, disable JavaScript, disable ActiveX, and disable or uninstall all plug-ins and add-ons. Of course, I don't recommend IE unless you come across a site that requires it. However, IE can actually be a godsend on older PCs with low RAM (it was the only browser that worked reliably on my old IBM Thinkpad 380ED with 48MB of RAM; even older Opera/Firefox versions didn't run nearly as well).