GPU for 3D rendering
I have some experience in programming a rendering and raytracing engine. 3060 12GB or 3090 24GB are your best bets in terms of price to performance right now. More slower VRAM is always better than having less faster VRAM. 2060 Super is both slower and has less VRAM, so I wouldn't consider it at all for the same price as the 3060. If you specifically want a 8GB VRAM card, I would personally wait for the 4060 or get a 3060Ti, because its price to performance is better than the 3060.
The same will be true with 4000 series cards. 4060 will have 8GB VRAM, so it will be worse than 3060. 4060Ti will have 10GB VRAM and it still will be worse than 3060, but I would consider it, since I highly believe that at least in the beginning you won't be using any high resolution textures and so on, as well as you will be creating simple one, maybe two character scenes, so a 10GB VRAM card is my recommendation for beginners in 3D.
You mentioned Cinema4D, so the rendering engine is V-Ray. I personally have no experience with this engine, but I highly believe that if the scene doesn't fit into the card's VRAM, the system RAM is used, so you might experience slowdowns in your renders. For example NVIDIA's Iray won't render a scene on the GPU at all if it doesn't fit into VRAM, the same is true for Blender's Cycles.

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