gorhill has proven his integrity time and time again, and that's hard to beat. He works on uBO because he believes in it and not for profit. It's the one thing that I would value, especially in an ad blocker. This isn't to say that there's anything wrong with AdGuard though.

Yeah honestly unless the developer can demonstrate that they don't allow ads through from who pay them to be allowed, pretty much no adblocker is going to be fully trustworthy. There will always be an incentive, if the adblocker is popular enough, for the dev to take money from an advertiser to bypass the block.

If I did have to trust any adblocker though, it would be gorhill's.