I don't love the name and websites...I only love the answers that are really useful and helpful to me, so it does not matter for me that whether they are wiki-answer or yahoo answers..I look for quality answers..
Beside this, in yahoo answer you can vote and ask if you like etc. while wikianswer is lacking in that things. Wiki answer is always changing as everyone has the authority of admin that he/she edit your answer while yahoo answer can't allow you to do so. If you look from an seo point of view then yahoo answer give you a good traffic while wikianswers are not so much useful.