For me, Safari's engine level blocking is huge. Safari ad blockers aren't just a mile long list of CSS rules (which can bog things down as much or more than add), they're JSON rule files that are compiled to byte code via LLVM and then applied to the list of resources that are allowed to be loaded BEFORE the page has loaded. Result: blocked elements aren't even requested and blocking has a near-zero performance impact. These extensions, being nothing but JSON, also can't track anyone or do anything malicious, giving you a 100% guarantee that it can't be highjacked and updated to do something malicious.
Aside from that, Apple's design decisions tend towards giving the user more control over their experience while Google seems mostly interested in wooing developers, regardless of cost (who cares about resource consumption or what the user wants?). Apple's approach aligns with me better.
