D3.js vs Three.js

D3.js is a very popular tool with an active community, resulting in plenty of learning resources and fast responses to questions.

Most of the examples provided are by the author, but there's also a great community writing plugins and more examples.

D3's emphasis on web standards gives you the full capabilities of modern browsers without tying yourself to a proprietary framework.

Can be tricky at first, but once learned, data manipulation and binding can easily generate complex visualizations for massive amounts of data.

D3.js offers incredible levels of interactivity.

D3.js is intended for modern browsers, so supports IE9 and above (IE8 with an additional library) as well as all the other modern browsers.

Effects: Anaglyph, cross-eyed and parallax barrier.
Scenes: add and remove objects at run-time; fog
Cameras: perspective and orthographic; controllers: trackball, FPS, path and more
Animation: armatures, forward kinematics, inverse kinematics, morph and keyframe
Lights: ambient, direction, point and spot lights; shadows: cast and receive
Materials: Lambert, Phong, Standard, smooth shading, textures, PBR and more
Shaders: access to full OpenGL Shading Language (GLSL) capabilities: lens flare, depth pass and extensive post-processing library
Objects: meshes, particles, sprites, lines, ribbons, bones and more - all with Level of detail
Geometry: plane, cube, sphere, torus, 3D text and more; modifiers: lathe, extrude and tube
Data loaders: binary, image, JSON and scene
Utilities: full set of time and 3D math functions including frustum, matrix, quaternion, UVs and more
Export and import: utilities to create Three.js-compatible JSON files from within: Blender, openCTM, FBX, Max, and OBJ
Support: API documentation, public forum
Examples: Over 150 files of coding examples plus fonts, models, textures, sounds and other support files

The documentation is detailed, providing clear explanations and code samples of the various features. There are also hundreds of examples available.

Thanks to the recently introduced forum, it is easy to find a community of helpful developers.

With the introduction of the new MeshStandardMaterial, three.js support physically based rendering (PBR) out of the box allowing for real life quality material and lighting.

Three.js has importers for most of the industry standard files format (obj, mtl, fbx, 3ds, gltf, collada, babylon, playcanvas, stl, vrml, draco and many more), making it easy to author assets in your favourite modelling software and import them for use them in three.js.

Three.js has great project health, with activity on Github daily for bug fixes and new features.

Three.js offers a canvas renderer as a fallback when WebGL is not available.

Three.js support many special effects and post-processing filters including particles, lensflare, sprites, real time reflection and refraction and even area based lighting.

The core of the three.js system is kept to a minimum to reduce file size, however there are also hundreds of extensions maintained in the offical repo on github, along with many free textures, fonts and models. You can find them all here.

Three.js official documentation provides plenty of well-written examples with a wide variety of tutorials written by the community available that you can find by doing a google search.