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 · Competitive PvP
Anime fighter debuting the Drive system and famously execution-heavy cast.

Execution · Grand Arena
A variation-based fighter where character specialisation choices and read-and-punish execution drive competitive outcomes.
BlazBlue: Calamity Trigger leans Execution (Competitive PvP); Mortal Kombat X leans Execution (Grand Arena).
BlazBlue: Calamity Trigger leans a little harder on execution, though the gap is small.
BlazBlue: Calamity Trigger
Long anime combos and tight defensive inputs
Mortal Kombat X
Variation-specific combo routes demand precise practice
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
BlazBlue: Calamity Trigger
Human opponents demand constant conditioning and adaptation
Mortal Kombat X
Reading opponent's variation choice and tendency shifts the matchup
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
BlazBlue: Calamity Trigger
Negligible randomness in matches
Mortal Kombat X
No RNG; transparent match flow
Mortal Kombat X leans a little harder on optimization, though the gap is small.
BlazBlue: Calamity Trigger
Frame data, drive mechanics, and matchup study
Mortal Kombat X
Variation selection and optimal punish routes require systematic study
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.