Google play store is the world. Loved its ui so simple and unique, almost all apps are available here. Don’t go for any other app store. Its the most safe app store, all apps are scanned and then are uploaded on play store. It gives very high downloading speed. I loved the way it updates the applications. Instead of downloading the full application it only downloads the selected part which is required for the update. No other app store provides such feature.
I recommend you to use it maximum and never use other application stores like mobogenie , moborobo, 9 apps , blackmart , etc as the apps available there are not scanned and they might contain malware and spyware, GO FOR GOOGLE PLAY STORE.