I did about 30 tests over the last few years (different sources, different genres), 100% of the time , x264 lossless compresses better than x265 lossless (at least for 8bit 4:2:0) with default settings. Typically a few % better .
FFV1 (in interframe mode) and x264 typically have the higher compression ratio . If source has identical content, duplicate frames, then lagarith can be better (null frame option)
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