Apples and oranges. I stand corrected about them snooping on users, but Mobidia is more upfront about what they do.[1] Onavo is deceptive, suggesting that they improve "security" and leveraging scammy marketing to drive installs.

[1] "Our goal is to provide you with a free, simple service without ads. To keep our service free, we provide research on market trends to help create better apps." https://itunes.apple.com/us/app/my-data-manager-track-your/i...