I have been using Google Hindi input for 2 years from now and believe me when I say I has made Hindi typing fun on my Android device.
Layout: The Layout of the Google Hindi Input keyboard is better than most of the default keyboards found in android device. Numbers from 0 to 9 are kept at the top of the alphabets so we don’t have to change the view to type numbers.
Speed: Since the layout of the keyboard is better, therefore the typing speed improves a lot especially when you want to type numbers. This also makes typing much more convenient.
Looks: Looks wise both this keyboard is better than the default one and I especially like the Dark theme more than the light theme.
Overall I would suggest you to use this app when you want to type Hindi, Marathi, or any Indic language for that matter because its simply the best one out there.