As someone living in China, a VPN provider that doesn't provide direct download links to their Android client is completely useless. The only way for me to install an app from Google Play store is to flash a custom ROM and install the Google Play Store, install another VPN (?!!) to access the Play Store, and then download the app in question.

Furthermore, the fact that Apple has just pulled VPN apps from its App Store and the unfortunate fact that you can't sideload apps makes iOS an untenable OS choice.