When comparing Opera Mail vs Yahoo! Mail, the Slant community recommends Opera Mail for most people. In the question“What are the best e-mail clients for Windows?” Opera Mail is ranked 7th while Yahoo! Mail is ranked 12th.
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Pro Opera Mail CAN BE set as default email client in Windows 8 & 10
Pro Automagic smart filtering
After a bit of use Opera learns what e-mail belongs in what folder just by previous usage. This makes for a convenient way to have e-mails filtered without having to manually mange every e-mail.
Pro Free and based on Mozilla code
Opera Mail is completely free to download and use and it is based on Mozilla's code, which is what makes it a bit similar to Thunderbird in looks and function.
Pro Intuitive user interface
The design of the UI in Opera Mail is clean and intuitive, making for an easy to use client.
With this Yahoo! Mail feature users can open any e-mail in a new tab and get back to the mail list without having to close the e-mail that the user is currently reading.
Stationary is an add-on that's only available in Yahoo! Mail. It allows users to customize and enhance the look of the email. Things like image borders, letter style etc. can be changed before sending the email to intended recipients.
Pro Background wallpaper
Similar to Mail app bundled in Windows 10, Yahoo! Mail allows users to set images from Flickr as the background image for the app.
Con Sync is slow
Opera tends to be slower on e-mail sync when compared to other popular clients.
Con Only supports Yahoo! Mail
Because it's a mail app developed by Yahoo!'s, it only supports Yahoo! Mail accounts.