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.

Execution · Pure Mechanics
A light-gun rail shooter testing reflexes and precise aim against dinosaurs.

Execution · Pure Mechanics
A loud, high-endurance test of accurate crowd control against relentless scripted enemy swarms in open arenas.
Dino Stalker leans Execution (Pure Mechanics); Serious Sam: The First Encounter leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Dino Stalker
Light-gun aim and fast reactions decide survival
Serious Sam: The First Encounter
Sustained accurate fire against enormous enemy hordes demands constant aim
Dino Stalker leans a little harder on reads, though the gap is small.
Dino Stalker
Dinosaurs charge on fixed scripts, nothing to predict
Serious Sam: The First Encounter
All enemies are scripted and follow fixed rush patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dino Stalker
Spawn timing adds modest unpredictability
Serious Sam: The First Encounter
Enemy placement is consistent across runs; no hidden information
Serious Sam: The First Encounter leans a little harder on optimization, though the gap is small.
Dino Stalker
Ammo and weapon management are light secondary concerns
Serious Sam: The First Encounter
Enemy priority and positioning strategy are learnable but shallow
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.