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.

Optimization · Practiced Mastery
Action RPG prequel to FFVII whose combat spins a slot machine for buffs.

Optimization · Systems & Chaos
Racing the day cycle to stack items faster than the seed punishes you.
Crisis Core: Final Fantasy VII leans Optimization (Practiced Mastery); Muck leans Optimization (Systems & Chaos).
Crisis Core: Final Fantasy VII leans a little harder on execution, though the gap is small.
Crisis Core: Final Fantasy VII
real-time dodging and attack timing
Muck
Kiting bosses and dodging demands basic action skill
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Crisis Core: Final Fantasy VII
no adaptive opponent
Muck
Enemies swarm on simple scripts
Muck leans a little harder on variance, though the gap is small.
Crisis Core: Final Fantasy VII
DMW slot reels randomize limit breaks and levels
Muck
Seeds, chest rolls and item drops shape every run
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Crisis Core: Final Fantasy VII
materia fusion is a deep solvable system
Muck
Power-stacking economy and day-loop routing decide survival
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.