Mine-imator is Easy to use and it doesnt take too lang and you can do great animations with it! I never used blender but it will take much more time and you must learn how to use it. Use blender when you are a profesional that is making quality animation. Use Mine-Imator when you didnt done modeling/animating before.
If you used blender before then use it but it will take more than Mine-imatir. I recommend mine-imator for you(It is easier and takes less time.)