Fragmotion is a full modelling software, however it is very limited compared to most 3D modelling programs, and (in my opinion) quite awkward and confusing to use.
In my opinion if you can afford the license then 3DS Max or Maya are currently the top options, but if you have a limited budget I would go for Blender, since the release of 2.8 it has really come on leaps and bounds, and had become a lot easier to use, it's even becoming a favourite of some of the big studios, for example ubisoft and epic are both supporting the development of blender with grants and they have started to move a chunk of their workflow to blender.
Blender has hundreds if not thousands of YouTube videos explaining how to use it, so you won't be short of information, and there are multiple artists here including myself that are more than happy to answer any questions you have
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