So what's the situation with hosted WP, what's the best in class for "I don't want to worry about reacting to vulnerabilities" in WP SaaS and how do you compare

So what's the situation with hosted WP, what's the best in class for "I don't want to worry about reacting to vulnerabilities" in WP SaaS and how do you compare / evaluate this? Or, are there 3rd party services you can contract to scan your WP setup?