As I see it your holding two dual edged swords. In the one hand you have code that can be reviewed by everyone. If someone finds a security vulnerability and choose not to report it that's one edge. The other edge is that you have more eyes reviewing the code so in theory security vulnerabilities are more likely to be found and fixed. In the other hand you have code that a select group of people review. If a security vulnerability is found by the vendor or a third party it may or may not get reported and fixed. The "advantage" being since not everyone can review the code theoretically fewer security vulnerabilities will be found, that does not mean they don't exist.

In either case if you are wearing body army, i.e. defense in depth, if you loose your balance you'll not be as badly hurt.

I am legally blind you insensitive clod!

So the really question is do you want me to drive?