The Speed: MKX is significantly faster than MK11. It features a Run Button and heavy combo-cancel mechanics, making it the "fastest" modern Mortal Kombat.
The Variations: Each character has three distinct fighting styles (e.g., Scorpion can choose between dual swords, hellfire, or minion summons), essentially giving you three characters in one.
The Guest Characters: It remains the only game where you can settle the ultimate horror debate: Alien vs. Predator or Jason vs. Leatherface.