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
A falling-piece versus puzzle testing combo building against an opponent.

Optimization · Practiced Mastery
A blocky free-to-play zombie survival sandbox mixing scavenging, basebuilding, and PvP.
Sonic Eraser leans Optimization (Practiced Mastery); Unturned leans Optimization (Practiced Mastery).
Unturned leans a little harder on execution, though the gap is small.
Sonic Eraser
Placing pieces fast helps but isn't twitch-defining
Unturned
Gunfights and driving reward aim and control
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Sonic Eraser
Versus mode rewards predicting opponent's board state
Unturned
Human raiders and ambushes on PvP servers
Unturned leans a little harder on variance, though the gap is small.
Sonic Eraser
Falling piece order is randomized
Unturned
Loot spawns and unknown player positions
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Sonic Eraser
Lining up combos efficiently to attack opponent is the loop
Unturned
Base building, loot routes, and crafting economy
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.