I tend to alternate between all of them to see if one of them will show me something that the other doesn't. For example, some links (like those to z-library for example) only show up on Duckduckgo, Yandex or Searx, and other times images that don't show up anywhere will show up on Bing, and other times Bing and Yandex will usually give me more accurate results, however as much as I hate jewgle, it will usually give me better results on more recent things but its pretty unusable now, hell you can't even search animal names without getting links to streaming services or products, and jewgle will even erase or hide older images and links of something that's trending, like hiding old stuff relating to old events that are relevant again or rebooted franchises. Yandex Images though is probably the best for reverse searching images. I also have to stress that the only worth DDG has for me is torrent links and whatnot. Brave is also pretty good, but I don't use it for searching much, but its still a great browser (although the interface still kinda sucks).
Overall I'd say the search engine that's been most helpful to me has been Yandex.