head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Practiced Mastery
Ezio's Renaissance revenge tale of parkour, assassination, and villa-building across Italy.

Optimization · Practiced Mastery
Isometric co-op puzzling testing coordination and trap-room solutions.
Assassin's Creed II leans Optimization (Practiced Mastery); Lara Croft and the Temple of Osiris leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed II
Counter-heavy combat stays forgiving
Lara Croft and the Temple of Osiris
Twin-stick aiming and trap dodging take light skill
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed II
Guards follow scripts
Lara Croft and the Temple of Osiris
Enemies swarm on fixed triggers
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed II
Fixed world and missions
Lara Croft and the Temple of Osiris
Puzzle and trap layouts are fixed once seen
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed II
Villa economy and route planning, lightly
Lara Croft and the Temple of Osiris
Co-op puzzle solving and score routing lead the test
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.