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
Rapid-fire recognition and reaction across hundreds of five-second microgames.

Execution · Pure Mechanics
Touch-screen reaction speed against a randomised barrage of microgames.
WarioWare, Inc.: Mega Microgame$! leans Execution (Pure Mechanics); WarioWare: Touched! leans Execution (Pure Mechanics).
WarioWare, Inc.: Mega Microgame$! leans a little harder on execution, though the gap is small.
WarioWare, Inc.: Mega Microgame$!
Reacting correctly in five-second microgames is the entire challenge
WarioWare: Touched!
Instant stylus reactions to five-second prompts are everything
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
WarioWare, Inc.: Mega Microgame$!
No adaptive opponent - microgames are scripted
WarioWare: Touched!
No opponent - just escalating microgame speed
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
WarioWare, Inc.: Mega Microgame$!
Random microgame order forces instant recognition each round
WarioWare: Touched!
Random microgame order demands instant recognition
WarioWare, Inc.: Mega Microgame$! leans a little harder on optimization, though the gap is small.
WarioWare, Inc.: Mega Microgame$!
Each microgame's solution is trivial once seen
WarioWare: Touched!
Each microgame is trivially solvable once recognised
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.