Investigating Apple Motion alternatives
Here is a list of alternatives to Apple Motion. It seems to me that most of the alternatives are 3D animation/modeling.

Adobe After Effects ($20/month, or $699)


  Adobe After Effects is a digital motion graphics, visual effects and compositing software package published by Adobe Systems, used in the post-production process of filmmaking and television production.


After Effects is your best alternative to Motion, in my opinion. However, it costs a lot more than Motion. Just stick with the $50 Apple Motion and you'll be fine. After Effects has great motion graphics, but there's also a whole lot more to After Effects than just motion graphics.