Alpha CC is favored by players who want their sims to be more lifelike. It removes the game’s cartoony style and focuses on precision, fine details, and recreating real-life looks. Its use is often accompanied by pose packs and other mods that can be game-changing in nature.
Alpha Custom Content tends to look more realistic, as in “like real life”, than Maxis Match content
The Sims 4 Maxis Match Custom Content