Google has been working on a safe browsing initiative for about 5 years. They have built-in plugins for Chrome, Firefox, and Safari. They have released some data on the initiative.
Google claims to find about 9500 new malicious websites every day.
They show a warning on their search engine for 12 to 14 million Goolge Searches per day.
They show malware warnings from about 300 thousand downlads per day.
They send thousands of notifications daily to webmasters as well as ISPs to help clean up issues.
I personally do not have a preference when it comes to browsers but this is a reason to lean towards Chrome or Firefox.