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
Solving camera placement puzzles, then executing the watch-and-shoot plan under time pressure.

Optimization · Pure Optimization
Side-on turn-based tactics where you manually aim ricocheting bullets for a steambot pirate crew.
Star Fox Guard leans Optimization (Practiced Mastery); SteamWorld Heist leans Optimization (Pure Optimization).
Star Fox Guard leans a little harder on execution, though the gap is small.
Star Fox Guard
Snapping between camera feeds to shoot robots needs quick hands
SteamWorld Heist
Manual aim and ricochet shots reward steady hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Star Fox Guard
Robot waves follow fixed scripted routes, nothing adapts
SteamWorld Heist
Enemy bots follow fixed behaviors
SteamWorld Heist leans a little harder on variance, though the gap is small.
Star Fox Guard
Wave compositions are unknown on first attempts only
SteamWorld Heist
Procedural ship layouts and loot drops
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Star Fox Guard
Camera placement and wave memorisation solve each map
SteamWorld Heist
Crew builds, weapon picks, and turn routing carry runs
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.