NextDNS vs Lockdown

I need you to help me decide which one to choose.

I never tried both but from names i can say:
NextDNS: is a dns server
Lockdown: is firewall service

So if you want to hide your activity from your ISP or man in the middle attack while you actually protecting yourself from trackers then use NextDNS (it’s not free so i guess there is alt like dnscrypt) and if you just already picked up your DNS server or its not your threat module then go with lockdown firewall