best format is lossless of some kind, either 10 or higher bit 4:4:4 chroma uncompressed or some lossless image sequence but the sound can’t be integrated with sequences.
Now, I did a image type shootout with Targa, Tiff, PSD, PNG, and only PSD and Tiff (lzw off) are 100% lossless. I personally use Tiff for these reasons.
lossless, alpha support,smaller size than PSD for same quality, multiproc thread safe, and used in major studios because it can go trillions+ and floating+ which are used for film, red cameras, when cineons break the hard drives, lol.