head to head
Neither is simply harder - they are hard in different places. My Racing Career demands more variance; Portal demands more execution.

Optimization · Pure Optimization
Long-horizon planning of driver development and race strategy through menus.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
My Racing Career leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
My Racing Career
Text-based management - zero physical input
Portal
Portal placement timing modest.
My Racing Career leans clearly harder on reads.
My Racing Career
Rival managers compete but through systems, not direct prediction
Portal
No adversary modeling player.
My Racing Career leans clearly harder on variance.
My Racing Career
Race incidents and development rolls add noise to plans
Portal
Deterministic chambers; no randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
My Racing Career
Driver development, setup and strategy math is the game
Portal
Pure puzzle-solving optimization.
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.