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 · Competitive PvP
Fast arena combat that tests combo execution and counter prediction against human opponents.

Execution · Competitive PvP
Classic fighting execution and human prediction atop a famously unbalanced roster.
Dragon Ball Z: Budokai Tenkaichi leans Execution (Competitive PvP); 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.
Dragon Ball Z: Budokai Tenkaichi
Combo timing, dashes and beam clashes reward fast hands
Mortal Kombat Trilogy
Dial-a-combo inputs and run-meter pressure demand fast hands
Mortal Kombat Trilogy leans a little harder on reads, though the gap is small.
Dragon Ball Z: Budokai Tenkaichi
Versus humans, predicting teleport counters and ki tactics matters
Mortal Kombat Trilogy
Human opponents must be baited into unsafe moves
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dragon Ball Z: Budokai Tenkaichi
Almost nothing random once movesets are known
Mortal Kombat Trilogy
Movesets are public; nothing hidden in a match
Mortal Kombat Trilogy leans a little harder on optimization, though the gap is small.
Dragon Ball Z: Budokai Tenkaichi
Character matchups and attribute builds are learnable systems
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.