Best, as in cheapest, or highest throughput, or easiest to configure? Your network type matters as well. A pi-hole works okay and is a low price option for a

Best, as in cheapest, or highest throughput, or easiest to configure? Your network type matters as well. A pi-hole works okay and is a low price option for a home network, but would get swamped on a work network. My suggestion: make a pi-hole, and see what you like about it. If it doesn't work for you, buy a real firewall from Cisco or similar. Then use the raspberry pi as a media machine or some other project.