A common debate among DJs is audio quality. If you are playing on a massive festival line-array system, audio quality is paramount.
320kbps MP3
This is the industry standard for digital DJs. It is a compressed format, but at 320kbps, the compression is virtually undetectable to the human ear in a club environment. It saves hard drive space while maintaining punchy bass and clear highs.
WAV and FLAC
These are lossless formats. They are identical to the original studio master. While they sound slightly fuller, the file sizes are massive (up to 10x larger than MP3). For 99% of club DJs, WAV is overkill.
The Golden Rule
Never play YouTube rips (usually 128kbps). They will sound muddy, thin, and harsh on a club system. Always download true 320kbps files from a reputable source like RPOOL.ID.