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 · Pure Optimization
Grand strategy wargame mixing turn-based empire play with real-time battles.

Optimization · Pure Optimization
Industrial-era economy sim; pops and markets above all.
Medieval II: Total War leans Optimization (Pure Optimization); Victoria 3 leans Optimization (Pure Optimization).
Medieval II: Total War leans a little harder on execution, though the gap is small.
Medieval II: Total War
real-time battle micro is modest
Victoria 3
no reflex
Victoria 3 leans a little harder on reads, though the gap is small.
Medieval II: Total War
campaign AI is exploitable and mappable
Victoria 3
AI scripted, limited adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Medieval II: Total War
fog of war and event triggers hide some state
Victoria 3
events, market shocks
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Medieval II: Total War
economy, unit counters, and campaign map strategy dominate
Victoria 3
economy, pops, laws solvable
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.