Comment by const_cast 2 days ago
I've never used these, but if I had to guess: these probably don't have the same power as full Manifest V2 extensions.
Also names like "Adblock Plus" scare me. I don't want someone I don't trust getting my web activity.
A quick Google search reveals AdGuard is only a DNS resolver, so it has the adblocking power of something like a Pi Hole. So... nowhere near as capable. It can't inject JS into webpages to prevent pop ups, which is going to lead to white boxes everywhere. In addition, ads can obfuscate the URL or share domains with non-ad content - so that content won't be blocked with a DNS resolver.
However, the software seems safe. Their privacy policy says they only store websites locally, and never upload them to servers. The app is also open-source.
Ad Block Plus is not privacy respecting. They collect usage data as well as unique device identifiers.
You don't have to guess, they're as capable as MV2 and AdGuard has been around for a long time.