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 football sim where reading opponents and precise execution both decide matches.

Execution · Competitive PvP
Classic fighting execution and human prediction atop a famously unbalanced roster.
FIFA 20 leans Execution (Grand Arena); Mortal Kombat Trilogy 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.
FIFA 20
precise passing, dribbling, and shot timing
Mortal Kombat Trilogy
Dial-a-combo inputs and run-meter pressure demand fast hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA 20
reading human opponent tactics live
Mortal Kombat Trilogy
Human opponents must be baited into unsafe moves
FIFA 20 leans a little harder on variance, though the gap is small.
FIFA 20
minor ball physics and injury randomness
Mortal Kombat Trilogy
Movesets are public; nothing hidden in a match
FIFA 20 leans a little harder on optimization, though the gap is small.
FIFA 20
formations and player builds solvable
Mortal Kombat Trilogy
Knowing the bloated roster's broken tech is half the battle
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.