I highly recommend Hitfilm for anyone who would be working with 3d cgi, simply because it has a built in 3d compositing feature, and obj models are supported. Hitfilm is both a video editor, and a compositing software very similar to After Effects. The free version is well worth a look. For even more control and depth, I would recommend working with BlackMagic's Fusion. The base package is now totally free, and is considered to be one of the best compositing packages on the market. It's used by high level studios, and the node workflow allows you a greater flexibility for compositing shots than the layer based After Effects or Hitfilm would provide. It's got a much longer learning curve as well, but the power here is worth the time. Again, very much like Hitfilm, it's free, but you can also upgrade to the paid version if and when you outgrow it.

https://www.blackmagicdesign.com/products/fusion

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