I've been using Kagi as my default search engine on my phone to test it out. Honestly, it just doesn't hit the convenience mark. when I search for a restaurant + hours, Google shows the hours in a card at the top of the results. Kagi can't or doesn't do that, and often doesn't even find the restaurant. I haven't used DDG so I'm not sure if they're similar, but for the average user Google just consistently hits the mark (of convenience)