3. Google Chrome
Browser choice is obviously a personal preference, and for many (particularly those embedded in the Google ecosystem), Chrome is an excellent choice. But on the other hand, Chrome is definitely not great for iOS battery life.
If you’re willing to switch, it might be better to use the native Safari app. It uses a handful of optimization techniques to save on battery consumption.
On the other hand, you can go to Settings > Chrome to make some energy-saving changes — like turning off Background App Refresh and setting Location to While Using.