It depends on the specific requirements of your setup.
A mixer is a device that combines multiple audio signals into one or more output signals. Mixers are often used in live performances and in studios where multiple microphones, instruments, and other audio sources need to be mixed together. They usually have multiple XLR and quarter-inch inputs, EQ controls, and effects loops.
An audio interface, on the other hand, is a device that connects various inputs (microphones, instruments, line level, etc.) and outputs (speakers, headphones, etc.) to a computer. It’s typically used for recording and monitoring audio in a computer-based recording setup. An audio interface will often provide lower latency and better sound quality than a mixer in this context due to its direct connection to the computer.
If you’re recording multiple tracks into a computer, you’ll need an audio interface. If you’re