Which is better, yahoo mail or gmail?
Yahoo is used a lot more for spam purposes. For that reason alone, Gmail is better.
I find Gmail to be easier to use, too.
Yahoo is known for spreading viruses and spam so I don't even use them myself anymore. Unless you want to be a part of Yahoo Answers, don't bother. Go with G-mail. They have more support and more options.
Gmail is all around better just because pf what they have to offer. If you like to use Yahoo Answers, make an e-mail for that but just don't use the e-mail. I know some people like to be a part of that messaging/Q&A board.
I use both personally but I would never use Yahoo as an important e-mail or a personal or business one. They have horrible security and people I know, as well as myself personally, have had their e-mails hacked in to.