I have not used any search engine expect Google and i am satisfied with it 200% . Google is best in all .
I always use Google for their link command. I'm looking for quality and not quantity. I'd like to see if some page is that important in Google and see why this page has been shown in Google link. Yahoo is better if you want to know amount of all links pointing to your site but that is not an indicator of quality link or not.
Most of time I use google. For total links I use yahoo link:www.xxx.com site:www.xxx.com These links are visible by yahoo, but it is not for google bot.