head to head
Buckshot Roulette asks more than Pokemon Stadium 2, and the gap is variance.

Variance · Systems & Chaos
A tense one-on-one Russian roulette duel with a shotgun.

Optimization · Systems & Chaos
N64 arena battler where rental and imported Pokemon fight in 3D tournaments and mini-games.
Buckshot Roulette leans Variance (Systems & Chaos); 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.
Buckshot Roulette
Trivial click inputs.
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.
Buckshot Roulette
Dealer has minor adaptive bluff tells.
Pokemon Stadium 2
Human PvP cups reward prediction; AI cups are mappable
Buckshot Roulette leans clearly harder on variance.
Buckshot Roulette
Shell order is hidden and random.
Pokemon Stadium 2
Accuracy rolls, crits, rental rosters add randomness
Pokemon Stadium 2 leans a little harder on optimization, though the gap is small.
Buckshot Roulette
Probability tracking and item use reward optimization.
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.