head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, 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 tag-enhanced Tekken that multiplies execution demands and opponent reads by adding partner management to every exchange.
Mortal Kombat X leans Execution (Grand Arena); Tekken Tag Tournament 2 leans Execution (Grand Arena).
Tekken Tag Tournament 2 leans a little harder on execution, though the gap is small.
Mortal Kombat X
Variation-specific combo routes demand precise practice
Tekken Tag Tournament 2
Tag combos and partner launcher extensions demand high motor precision
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
Tekken Tag Tournament 2
Tag crash timing and incoming character reads against humans are constant
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mortal Kombat X
No RNG; transparent match flow
Tekken Tag Tournament 2
No RNG; all information is visible
Tekken Tag Tournament 2 leans a little harder on optimization, though the gap is small.
Mortal Kombat X
Variation selection and optimal punish routes require systematic study
Tekken Tag Tournament 2
Tag team pairings and shared health management reward deep preparation
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.