head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Grand Arena
A variation-based fighter where character specialisation choices and read-and-punish execution drive competitive outcomes.
Execution · Grand Arena
A hero shooter where teams brawl over objectives using locked ability kits.
Mortal Kombat X leans Execution (Grand Arena); Overwatch 2 leans Execution (Grand Arena).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Mortal Kombat X
Variation-specific combo routes demand precise practice
Overwatch 2
Aim and ability timing decide most duels.
Mortal Kombat X leans a little harder on reads, though the gap is small.
Mortal Kombat X
Reading opponent's variation choice and tendency shifts the matchup
Overwatch 2
Adaptive enemy comp counters and ult baiting.
Overwatch 2 leans a little harder on variance, though the gap is small.
Mortal Kombat X
No RNG; transparent match flow
Overwatch 2
Minimal randomness, mostly map and matchmaking.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Mortal Kombat X
Variation selection and optimal punish routes require systematic study
Overwatch 2
Comp building, ult economy, and cooldown tracking.
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.