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Both Firefox and Opera are excellent browsers and I use both. Firefox has the benefit of many more more plugins while Opera is more ergonomic. However, Opera is best browser by far when you have to work the internet hard. I often have 50 or more tabs open without any problems. The most recent version of Opera however, has got worse in that it now strips all the files in the cache of their identities (jpgs, gifs etc.). When reesearching, going into the cache is one of the best ways of saving the various files that you need and in Opera they used to all be clear and available for opening in the usual software. I therefore gone back to version 9.27 as this was the last one to keep a good and usable cache. Google Chrome is worse as it actually deletes the cache when you close the programme. Internet Explorer is good in that it allows you to download whole websites, an old feature not used much these days but great for workers with laptops who need certain sites a lot but have problems connecting. However, that's about the only good thing it has.
With browsers, like anything else, much depends on how intensive you use them.