The main difference between Opera Mobile and Mini is that Opera Mini traffic is tunneled through Opera servers automatically which do much of the heavy lifting in the process while that is not the case for Opera Mobile.
Both versions feature the new Opera icon but that is where similarities end. The big new feature of Opera for Android is support for video compression which users of the browser can enable in the settings under “data savings”.
This reduces the amount of data required to stream the video to the mobile device and the time it takes before the video starts to play.
The browser features improved video controls and other under the hood changes in addition to that. Last but not least, its engine has been upgraded to Chromium version 46.
Opera Mini on the other hand received — mostly — usability improvements. For instance, when you select to open a website in a new tab in the browser, it is now loaded in the background while you continue on the page you are on.
An option to switch to the new tab is displayed as a notification at the bottom of the screen giving you the option to switch to the linked page right away.
The mobile browser highlights completed downloads in a similar fashion now in the interface. A prompt is displayed at the bottom of the screen when downloads finish that allows you to open the downloaded file right away in the browser.
The context menu on pages have been redesigned to be more in line with those of other Android apps. Last but not least, if you have enabled Facebook notifications in Opera Mini, they do include Facebook profile pictures now.