head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is variance, 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 · Competitive PvP
The foundational test of fighting-game execution and human prediction at speed.
Mortal Kombat X leans Execution (Grand Arena); Street Fighter II' Turbo leans Execution (Competitive PvP).
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
Street Fighter II' Turbo
Charge timing and anti-air reactions at turbo speed
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Mortal Kombat X
Reading opponent's variation choice and tendency shifts the matchup
Street Fighter II' Turbo
Fireball-trap mind games against an adapting human are the essence
Mortal Kombat X leans a little harder on variance, though the gap is small.
Mortal Kombat X
No RNG; transparent match flow
Street Fighter II' Turbo
Twelve public movesets, nothing hidden
Mortal Kombat X leans a little harder on optimization, though the gap is small.
Mortal Kombat X
Variation selection and optimal punish routes require systematic study
Street Fighter II' Turbo
Matchup theory and spacing fundamentals were codified here
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.