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

Reads · Grand Arena
A fast card game where the snap mechanic makes reads central.

Optimization · Grand Arena
Territory math and dice management entangled with reading human alliances.
Marvel Snap leans Reads (Grand Arena); Risk: Global Domination leans Optimization (Grand Arena).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Marvel Snap
No execution component
Risk: Global Domination
Clicking territories takes no physical skill
Marvel Snap leans a little harder on reads, though the gap is small.
Marvel Snap
Snap/retreat decisions are pure opponent psychology
Risk: Global Domination
Human diplomacy, truces and betrayal timing cannot be solved
Marvel Snap leans a little harder on variance, though the gap is small.
Marvel Snap
Hidden locations and draws drive swings
Risk: Global Domination
Dice rolls swing battles and mission cards hide information
Risk: Global Domination leans a little harder on optimization, though the gap is small.
Marvel Snap
Deck construction and curve still matter
Risk: Global Domination
Continent bonuses, troop math and border control are calculable
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.