Over the last weeks, I became more and more disappointed with Safari. Too many websites don't really work with it. Try selling something on eBay with Safari, for example, or homebanking with certain banks. Several corporate pages that I had to use professionally also did not work with Safari.
So here is an example of 'your mileage may vary'
I use Safari all day, every day with no issues on either eBay, my home banking or indeed most other sites.
However, I do have a problem when I try to access the embedded webserver in my companies appliances using Safari. Coincidentally I also have problems with Firefox but in different pages of that same server.
So, I use Camino when I access the appliances, Safari for EVERYTHING else. Firefox is good, but its no better than IE or indeed Safari (In my Humble Opinion). Each has its benefits, each has its drawbacks, none is perfect.
It's just specious to claim your favourite browser is better than your least favourite browser. I accept that no one tool will do all jobs.