Music genre should play an important role in the type of DJ mixer you purchase. 1. If you DJ house music, then it is important you look for a mixer with a good amount of filters and effects. 2. If you play pop music or hip hop, you should be looking for a mixer that enables you to perform easy scratching and cutting. 3. If you are a hardcore DJ or play drum and bass, you should look for a mixer with multiple formats of input, and with more than 2 audio channels.