It's something you'll really have to make your own mind up on.
Some are faster some have more controls or add-ons and some are more secure.
What I did a few months ago is download the most popular and install them all. Then I tried them all over a period of time and trashed the ones I didn't like.
Look at Google Chrome, Safari, Opera and Firefox. They are the most popular in addition, of course, to Internet Explorer.
My preference - Firefox.