Seriously though, if I ever see "Yahoo Search", or "Bing Search" on my iDevices, I'm out the door.
If for some inexplicable reason I wanted to go to Bing or Yahoo, I'd go via Google. Pretty much sums up those alternatives for the majority, I'd imagine.
Dude if you did a blind comparison, you probably wouldn't know the difference. Try for yourself. Moreover, in some ways Bing is better. For instance, Google has copied Bing's image search format. When it comes to a web search, most times I couldn't' tell the difference. Bing has come a long way.