When comparing Little Snitch vs Radio Silence, the Slant community recommends Radio Silence for most people. In the question“What is the best OS X firewall?” Radio Silence is ranked 1st while Little Snitch is ranked 2nd. The most important reason people chose Radio Silence is:
This app, like Little Snitch, selectively blocks outgoing connections, but it has a more detailed network monitor. Get this if you want an easier to use and more affordable firewall than Little Snitch.
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Pros
Pro Protected even at login screen
Little Snitch rules work even at login screen. Even when receiving attempted connection alerts, once logged in LS has stopped and requested permission for them.
Pro Comparatively easy to use
Easier to use than traditional firewall software, but more powerful due to design and workflow.
Pro Protects your privacy
Protects your privacy and helps to prevent unwanted connections.
Pro Cheaper and easier to use than Little Snitch
This app, like Little Snitch, selectively blocks outgoing connections, but it has a more detailed network monitor. Get this if you want an easier to use and more affordable firewall than Little Snitch.
Pro Normal system processes don't produce popups
It has internal filters for normal operating system process, so they don't produce popups, preventing the firewall from nagging you excessively. This feature can also be turned off.
Pro Tiny footprint
This app is tiny and fast. It won't annoy you with tons of popups, neither will slow your system down, not even on older Macs.
Cons
Con It is not well suited for security conscious professionals
The lack of expert configuration options leave us with only the most basic protection.
Con It defaults to allow all connections
Unless you specifically add an application to the blacklist, it will be allowed by default, making the firewall easier to use to the novice, but also letting you potentially leak valuable data by a rogue app.