I’m suggesting that if the top result works it doesn’t matter. More, I’m suggesting that the next time you want to suggest a challenge you should run it yourself, first.
Don’t know what to tell you except that one of them is known to filter and personalize results, definitely leverages your IP address and other identifiers, and the other claims not to.
No, it's still far inferior to Google search.
Try "D without garbage collection" in both, and get back to me.