Probably the best thing is to install both and test drive them out to see what you personally feel more comfortable with. :iagree:
Chrome is also worth trying out. If you're worried about security, in a recent hacking competition using Internet Explorer, Safari, Chrome and Firefox, Chrome turned out to be the most secure and the only browser tested to resist being exploited. In a PC World speed test, Chrome also turned out to be the quickest of these 4. Unfortunately, both the hacking competition and speed test did not include Opera.
Personally, I prefer Firefox on both my PC (running Windows XP) and portable Asus EEE (running PCLinuxOS). It seems to have everything I need, including Ad-block plus, development tools and Firebug and would find myself lost without these. For my Mobile phone (Nokia 6300), I use Opera Mini (java app.), as it does a great job at rendering websites for its small 240x320 resolution screen and is far quicker at loading pages than the phone's built-in web browser.