MixRank does a decent job at lead prospecting and allows users to pull a significant list quickly. Overall it is a decent product and I've used it at both of my prior companies. It is best suited for sales teams or account management teams trying to find emails or prospects and determine which platforms they are using in order to make sales calls more focus and relevant.
Mixrank has the ability to search the Apple Appstore for different SDKs however, Datanyze does not have this same ability. The ability to deliver granular searches easily, played a key role in our decision to choose Mixrank. Where Mixrank lacks is the email verification that Datanyze provides