WMA is Windows' old house band: big in the early 2000s, mostly retired now. It was born in 1999, Microsoft, and its real weak spot is the modern world: Apple devices, browsers and most apps have moved on.
AVI is the veteran of desktop video: dependable in 1995, cranky about everything invented since. Audio Video Interleave: an early container that predates streaming and most codecs you'd use today. That makes it the right destination when what you need is opening old archives and humoring legacy Windows tools.