Synfig is much simpler – as in straightforward -than Moho, which I don’t know well, sorry. It uses the sif and sifz (zipped sif) formats. It works with generic svg files – meaning if you want to import images while you can use any bitmap format for vector drawings it is recommended you do it through inkscape. (290) Open-source vector graphics tool with object creation and manipulation, rendering, text support, fill and stroke functionality.

Synfig Studio Tutorial
Synfig Studio is a powerful open source application for creating high quality 2D animations with bitmap and vector graphics.
The program speeds up the animation process by removing the need to create each frame individually. Instead you can have Synfig Studio generate your frames itself by morphing from one image to another, or applying one or more transformations to individual shapes (rotation, scale etc).

Synfig Studio Tutorial
Alternatively, if you'd like to use a frame-by-frame source, the program's tracing tools will help you convert it into vector shapes which you can then manipulate with its other tools.

Features include a comprehensive bone system, bitmap painting engine, path-based gradients, a wide range of layers ('geometric, gradients, filters, distortions, transformations, fractal and a few others'), while High Dynamic-Range Imaging reportedly delivers 'better lighting effects, and improved color composition'.
Version 1.3.6 changes include: Citrix workspace app macos os.


Verdict:
Synfig Studio is a versatile application which can help you produce anything from a simple web animation (move this object from here to there) to a professional film-quality animated movie. It's also vast and takes time and effort to learn, but if you have the motivation then there's plenty of high quality documentation to explore.
