Which of these do you prefer? I used fdroid but haven't installed a system ad blocker. I just use firefox focus which does a good job of preventing trackers and most ads but it's not perfect.
Blokada does track how many ads it blocks and gives you a count (and notifications if you wish to be so notified [configurable]).
Both are free (as in the GNU 'freedom' definition as well as the 'beer' definition) so you could try both and see which you prefer.