Which cloud storage app is best? Dropbox, with its great sharing tools and support for multiple computing platforms, is arguably the best choice for consumers. But Box for iPhone and iPad is a better choice for business and enterprise users, particularly if you need powerful collaboration and security features. Box's $15 a month plan provides a cavernous 1,000 GB of storage as well as full text search, download statistics and tracking and many other business-friendly features; the enterprise version adds a slew of administrative tools, including Salesforce.com integration and mobile device management. The Box app also lets you secure information with file-level encryption, a 4-digit passcode and automatic logout when the app is closed.