iPhone (10000 programs)

Pros: Small app file size. End-to-end file encryption. Upload support up to 10GB. Has an offline access feature.

Cons: Free storage capped at 15GB.

Pros: Beautiful anime-style visuals and music. Strategic dungeon battles. Fun home-building and customization.

Cons: Progress can be grind-heavy.

Pros: Supports a wide range of formats. Easy to use. Supports 'Open In...' iOS dialog.

Cons: Quite buggy.

Pros: Nice real-world armies with unique look. Some good strategic elements to larger battles. Campaign missions are great.

Cons: Just another time-management game. Up close it looks pretty basic. You are frequently met by time/payment walls.