head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is optimization, and it is a single point.

Optimization · Pure Optimization
A football management sim about building squads and optimizing tactics against variance.

Optimization · Systems & Chaos
N64 arena battler where rental and imported Pokemon fight in 3D tournaments and mini-games.
Championship Manager 2008 leans Optimization (Pure Optimization); Pokemon Stadium 2 leans Optimization (Systems & Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Championship Manager 2008
Menu management requires no physical skill
Pokemon Stadium 2
Menu-driven turn battles; no physical demands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Championship Manager 2008
Opponent AI tactics are somewhat predictable patterns
Pokemon Stadium 2
Human PvP cups reward prediction; AI cups are mappable
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Championship Manager 2008
Match results and injuries carry significant randomness
Pokemon Stadium 2
Accuracy rolls, crits, rental rosters add randomness
Championship Manager 2008 leans a little harder on optimization, though the gap is small.
Championship Manager 2008
Squad building, tactics and transfers are the deep core
Pokemon Stadium 2
Team building, movesets, type matchups are 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.