4TW.Throw distance, speed, prisms effects, macro effects, physical size, cost... There are plenty of reasons to choose certain fixtures for certain areas/purposes. Sometimes you need something with a high output and a far throw that doesn't need to move fast, sometimes you need something small and compact that can throw light around fast but don't need a huge output. Other times you need a zoomable fixture with shutters and CMY. The list goes on... other times you have X to spend and need Y fixtures, so you divide and see what you end up with.
The MAC600 has CMY. It's one of the older CMY fixtures. It's been an industry standard for what is termed as "forever" in the modern automated lighting industry. It's a great wash fixture and still regularly goes out on tours.