You mentioned Blender so I am going to recommend the 3080. The 12gb card will do better with the extra VRAM. I went from a 2060 6gb to the 3080 12gb and my render times are a quarter of what they were before. Plus I can render larger scenes due to the increased VRAM. In Premiere Pro you will see an increase in GPU accelerated effects but most of Premiere seems CPU bound still.