What ad blocker do you use on Android?

I prefer ad blockers having the ability to block ads in apps, not just inside a browser, I started with Adguard, but since they're subscription base, I switched then to similar but free option called Stopad, https://stopad.io works cool for me

I disable JavaScript on all sites and then whitelist the sites I'm willing to accept JavaScript on. The whitelisted sites are sites with whom I have an ongoing relationship. For example, HN which uses JavaScript to expand/collapse comments.

This is nearly 100% effective.

Most sites are usable (usually a lot more usable) with JavaScript disabled. On some sites the layout is not as the site intended, but is still usable (often have remember to scroll down to see the content). A few sites refuse to serve content without JavaScript. Mostly I ignore those sites. Some times I enable JavaScript temporarily to read their content, but I usually have "buyer's remorse" after seeing the (low) quality of their site's content.

I use AdGuard. It's a paid solution, but I got a lifetime subscription for two devices and they do a really great job with regular updates. It has saved me a ton of mobile bandwidth over the years. It doesn't require root and it works across all your devices apps, not just the browser.

DNS66 is available on F-Droid and doesn't require root ;) https://f-droid.org/app/org.jak_linux.dns66

AdAway but it requires root so it can block things via the hosts file