I have used Firefox for many years myself and for a PC it's my browser of choice (and for the departments I work for at a university).
Firefox has had it's stability issues especially after update releases and if you run a lot of add-ons but over all it's one of the best browsers out there.
Opera Mobile is one of the best browsers out there for PDA's hands down but I wouldn't know about the PC version.
Everyone's style and needs are different so I'm just thankful for having the option of multiple decent browser platforms to choose from
