Srep can indirectly show if delta is good or not, anything srep's ratio can go below 70 or 65% then delta helps.
dont forget that srep delta and lzma are all based on lz77 matchfinding architecture 
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My projects : Masked Compression, lzma2(xz) on Freearc, Zstd compressor for windows
My optimizations : packjpg.exe, zstd, lzham, precomp-dev-0.45.
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