I have got my own blog and begun to use the new domain since the very beginnin of this Feburary.I submit my blog to Yahoo and sitemap.xml in Yahoo webmaster tools without any delay.Google indexes my blog in less than two days while Yahoo hasn't indexed my blog yet.Why is Yahoo so slow to get my blog indexed?
Yahoo's technology is not yet at par nor ever closer to that of Google. It is obviously the drawback of yahoo.
Google is far better than Yahoo and the reason Yahoo is slow is because of their old days algorithm. They are slowest to index a website as they are still considering keywords to rank a website. Or maybe some more issues. Also if you talk about worst things of Yahoo, then talk about Yahoo answers. Every now and then they have some sh*t policies which ban the members. Their directory service which paid and what not is paid from Yahoo. How the hell they can compete with G when Google is providing too many useful tools in free.
Yahoo search method is very old means yahoo algorithm not update. yahoo always faith only on old URL.
I would say, its because Google has time to time, updated their algorithm and informed the people like us, how it works. However very few people know about the algo of yahoo. It might be possible that Big G also spreads its news in media and on the net which automatically becomes big.