Blender is better because it has better movement controls, you can build your own facial features, the Cycles render engine, you can make games in Blender. I mean really, Inverse Kinematics and Forward Kinematics are all the rage now. Although Mine-imator is what got me into Minecraft animation, I am sad to say, it is outdated in a sense, for instance, IK and FK controls, being able to have things like cell fracture, boolean modifiers and a ton more are lacking from Mine-imator. I may only use Mine-imator for thumbnails, that's it.