High-res pictures are the only pics worth anything to me (like, super high-res, which is not easy to find for me unless you just stumble across it.) I quite prefer images to videos when it comes to finishing. But, both are fine. Pictures tend to have more aesthetic quality to them. PoV vids, specifically, are great to finish to, but pics are better, in my opinion. Also, AI Gigapixel is very useful for making pictures super high-res, though the smaller the input picture, the more warped the output will be.