Do you want is to explain how Opera is better than Chrome?
It has several small things that chrome doesn't have. Mouse gestures, tab menu, sidebar for extensions, visual bookmarks, centered images, Opera turbo, discover and many more.
-i don't know. i think you'll find that chrome just leaves some of those things to the user to decide, so they can install an extension for that functionality. opera tends to integrate it (ex. mouse gestures). visual bookmarks and sidebar are more a layout thing and a personal taste. i'm not sure what you mean by tab menu? chrome uses tabbed browsing? so i must be a tad ignorant with that phrase(?).
-personally, i find them very similar. and i use both. opera has its own app store, but can use chromes as well. bit opera's apps are all found in chromes (as far as i can see).
-opera has a different updater.
-chrome has some added features that make it a little bigger (i believe). i could be wrong, but nacl and sandboxing, etc.
-chrome always annoys me by adding startup processes to my boot.
-overall very similar. but they used be be more similar a couple of versions ago. i think opera has started trying to implement things the vivaldi browser is offering, to try and take any wind out of their sails before they gain momentum. its a dog fight. will be interesting to see where it goes.