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
One-hit-death shmup execution through memorised alien-intestine stage patterns.

Execution · Practiced Mastery
Demanding platform execution plus a solvable boss-weakness ordering puzzle.
Abadox: The Deadly Inner War leans Execution (Pure Mechanics); Mega Man leans Execution (Practiced Mastery).
Abadox: The Deadly Inner War leans a little harder on execution, though the gap is small.
Abadox: The Deadly Inner War
One-hit deaths make every dodge a perfect-input demand
Mega Man
Pixel-precise jumps and shots against brutal fixed stages
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Abadox: The Deadly Inner War
Enemy waves are fully scripted
Mega Man
Robot Masters cycle rigid scripted patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Abadox: The Deadly Inner War
Stages replay identically once seen
Mega Man
Nothing changes between attempts
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Abadox: The Deadly Inner War
Memorising spawns and checkpoint routes is mandatory
Mega Man
Boss-order weakness routing is a known solvable layer
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.