Google Chrome is a futuristic and highly compatible web app that can be used to when logging in to popular news sights, like Facebook, Tumblr, Twitter, Instagram, and WordPress. However, Chrome will not bring you news; you need to be an experienced internet user to know what to search.
Opera Browser is primarily a news app. Seriously small, fast, and user-friendly, but will not keep you from downloading more apps. Your online experience will degrade when trying to login to most popular websites. Opera is made for browsing, is safer, and best used as a default internet browser.
In short, use the light Opera Browser to guide you, but use the bulky Chrome Browser to save space.