It really depends what you want to do. TUNE (full disclosure: I work with TUNE) focuses on providing a holistic mobile marketing suite that helps you acquire users (organic & paid), understand them (segments/cohorts), engage them (push, in-app messaging, etc.), and monetize them. Attribution is a big piece of this puzzle (and TUNE provides it) but it's only a piece. For optimum success, you need to look at the bigger picture.