Hacker's used to be the number one virtual keyboard, and then Swiftkey came along. The Google keyboard used to be considered junk, but now is considered terrific. If you're happy with your keyboard, and often the keyboard that came with your phone works just fine for you, no problem just staying with it. But, if you want to see the new great and top-rated free keyboards out there, just type something like "best free keyboards for Android" (without the quote marks) into The Google and you'll easily see various options, one of which might be just the thing for you.
Many of our readers like to know what we use here. While we let each of our employees use whatever keyboard he or she wishes, it turns out, to a person, they prefer Hacker's. They find it the most aesthetically pleasing, and really love the symbol row that the Google keyboard lacks.