Compared to stock browser
+ bookmarks
+ downloading, stock browser doesnt let choose folder and seems to randomly choose between .tmp and Downloads, clearing Transfers with stuffs in .tmp will also remove them from memory.
+ clearing history,cookies, user/pass can be done separately
+ save page for offline reading, I use this alot
+ speed dials
+ tapping multiple links results in zoomin with links highlight.
- keyboard, tapping Shift = Caps Lock and no tacticle feedbacks
- rotation in every direction, wish I could disable it or having opera to follow orientation lock like glol.
- audio, video

Eventhough I like Opera but right now my main browser is still stock due to keyboard and audio/video support.