Over 10% of Alexa TOP Million Websites Are Not Safe – Infographic Report
blog.sucuri.net
blog.sucuri.net
WP 3.6 (current version) has no security updates listed in the release notes (http://codex.wordpress.org/Version_3.6), and it's entirely possible they (WP) added vulnerabilities in this release. Just because it's newer doesn't mean it's better.
Sucuri, you just lost my respect. You should know better.
The fact that google lists a much lower number is a telltale here, google is doing a pretty good job of staying current in this respect and with McAfee and other companies that trade lists they pride themselves on size of the list which skews them towards fast addition but slow removal.