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.

Execution · Pure Mechanics
An on-rails shooter testing raw aim speed against memorised spawn scripts.

Execution · Practiced Mastery
Precision sniping and arena navigation through fixed, gimmick-laden levels.
Heavy Fire: Afghanistan leans Execution (Pure Mechanics); MDK leans Execution (Practiced Mastery).
Heavy Fire: Afghanistan leans a little harder on execution, though the gap is small.
Heavy Fire: Afghanistan
Aimbot literally completes this on-rails shooter
MDK
Sniper-mode precision and arena dodging demand steady hands
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Heavy Fire: Afghanistan
Enemies pop up on a fixed script
MDK
Alien enemies behave on fixed scripts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Heavy Fire: Afghanistan
Spawns are identical every run once seen
MDK
Levels are authored with nothing random
MDK leans a little harder on optimization, though the gap is small.
Heavy Fire: Afghanistan
Memorising spawn order is the only depth
MDK
Learning arena gimmicks and item use solves each level
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.