I'll do the
tl;dr up top
You will get information from any search engine you choose so in the end, it should come down to your preference. I definitely prefer something other than Google for my iPhone and iPad these days.
Personally, I switched everything to Bing as my default search engine about 2 weeks ago. Google's search results continued to take 1/2 of the page with sponsored results and various other tidbits that I am far from interested in. I opted to try another engine. I like Bing for the most part but Google seems as though it is a bit more intuitive.
For example, if I Google a celebrity's name, I would like IMDB and wiki to be the first few results. There have been a couple of times in Bing where IMDB was not even on the first page. Perhaps because I was looking up a more obscure actor's name.
Now I am using this javascript blocker which I think helps with the whole Google sponsored links issue I have. Doing a side by side search, my results vary between google and bing.
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Depending upon what I am looking for, I may not want to see shopping results. This is a search I actually did and first and foremost, I was curious about whether or not there was actually sunscreen for dogs. Shopping links are nice and all, but chances are, I'm shopping on Amazon if I am shopping online for something like that.
Bing also does this thing about connecting to Facebook. I want to rid the screen of that option because no, I do not want to connect with FB and let half the world see what the hell I search for on a daily basis.
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As for Yahoo!, I do not typically use their search engine but I do read their poorly written news articles. If you want to see some **** journalism, that's the place to go. Like a moth to a light, I still go to that damn site and read their sensationalized headings and articles riddled with poor sentence structure and baseless facts.