does Brave block trackers/ads better then uBlock Origin?
Technically, µBO can block more ads and trackers than most other adblockers, especially in advanced user/medium mode, and users can add various custom lists, e.g. to block 1st party CNAME trackers. I use Brave's built-in Shields and I never see ads, though there are reports in the Brave Community of them sneaking through. These reports usually come from countries/regions where Brave adblocking is not as comprehensive, i.e. adblocking is stronger in U.S. & EU, but Brave quickly fixes these missed ads/sites. BTW, the famous @fanboynz (fanboy's list) is a list maintainer for Brave!
The Brave Shields UI (in the address/toolbar) has a really good interface. If a user lowers Shields for a site that appears broken, you may report that site to Brave directly from the UI - if the broken site cannot be fixed with a custom rule. --> Users may create custom rules to block cosmetic elements, e.g. ad placeholders. And users can also make site-specific exceptions directly from the Shields UI . My view: Brave's Shields is the best and most user-friendly of all built-in adblockers.
For additional tracking protection I advise either Privacy Possum or ClearURLs, or Privacy Badger (my least favorite choice). Try it, you might like it!