Because it’s written in C# and relatively new. Unbound is written in C so should consume less resources, has been around longer and has been vetted – FreeBSD and OpenBSD replaced BIND with Unbound.
The one downside to Unbound is that there’s no GUI so it can be a bit intimidating to set up. But the docs are excellent and Unbound defaults are secure, so it’s not as hard as it seems.
The one downside to Unbound is that there’s no GUI so it can be a bit intimidating to set up. But the docs are excellent and Unbound defaults are secure, so it’s not as hard as it seems.