Hi, the other comments have said it pretty well, but you can also check out my previous post for some of the other comparisons.
I went from Pihole > Adguard Home > Technitium, and stuck with the last one because it supports clustering (syncing data between nodes) and recursion (so no need for external Unbound). The interface is a bit complex and there is no dedicated documentation, but should be intuitive enough as you learn.
If you want something simpler, I think Adguard Home is a better choice than Pihole as it natively supports encrypted DNS protocol, and has a sleeker UI. But other than that Technitium is nice as you expand your homelab eventually.