I actually mostly use yahoo's search engine,bit i have to agree that you'll have to focus on google's ranking,since it's the most popular nowadays.
I used Both yahoo and google. I can not point out which one is the best. In reallity, both have the advantages, you can observe it by using speciall keyword, see your consumens which country come from?
Close to 100% of my sales are the result of Google, so based on that, Google, in my opinion, is the best and might as well be the ONLY search engine.
they are both very good, it's just that google is more popular... and for some specific researches google is more likely to give you the vest answer
Yes, I agree with this, because in fact many people prefer google as a search engine compared to yahoo. Sorry if my words are wrong.
In my humble opinion, both are equally good as I am still using them to search for products and both give different result. But in the end, I do find what I wanted with either one. That's what I am looking for!