I have very strange graphic issues using nvidia dds plugin for photoshop when it saving file. And the saving time is very big, comparing to png
PNG's lossless compression can be sometimes more efficient but GPU can't use it... And the final size of the DDS file depends on the used internal format (compression ratios: DXT1 1:6, DXT5 1:4, RGBA8 1:1 ). PNG is good for storage because it is lossless, DXT1,DXT5,ATI1,ATI2 are lossy formats and usually their quality is much worse than JPEG with the same size...