Tor Browser for both security and privacy, but you won’t like it because it’s slow.
Your question combines two separate features in the same way that the nearly useless question “which is the best and the cheapest” does. You could ask for the best quality/price -ratio. You can have great security with no privacy when you use a well-made big tech solution. You can have great privacy with low security when you choose a poorly made, easily hackable open-source solution.
Tor Browser for both security and privacy, but you won’t like it because it’s slow.
Your question combines two separate features in the same way that the nearly useless question “which is the best and the cheapest” does. You could ask for the best quality/price -ratio. You can have great security with no privacy when you use a well-made big tech solution. You can have great privacy with low security when you choose a poorly made, easily hackable open-source solution.