Adguard or NextDNS, pros and cons?

Hi, in my quest to protect more and more of my digital life, i’m learning about DNS to block trackers (mainly on Android).
I’m a GrapheneOS user, and on my main user profile, i still have some apps full of trackers and would like to block as many as possible. I know about NextDNS and AdGuard, and would like to know what is the main difference between them, is there one better than the other for my case…?
I have Mullvad VPN always on, so am no concerned by their local VPN offer (AdGuard). So what is the best option to go for to block android apps’ trackers?
PS: it’s not necessarily for adds, but mostly for analytics trackers, even if adblocking is a plus but both option offer it.

Why not use Mullvad’s own DNS service? It does ad and tracker blocking, and you have fewer parties to trust, since your internet traffic is going through Mullvad servers anyway.

I’m not sure if they’ve added a toggle or button for it in the app, but if they haven’t here’s a guide: