head to head
Neither is simply harder - they are hard in different places. International Cricket Captain 2008 demands more variance; Portal demands more execution.
Optimization · Pure Optimization
A deep cricket team management simulation.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
International Cricket Captain 2008 leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
International Cricket Captain 2008
minimal direct input, mostly management
Portal
Portal placement timing modest.
International Cricket Captain 2008 leans clearly harder on reads.
International Cricket Captain 2008
opposing captain tactics somewhat readable
Portal
No adversary modeling player.
International Cricket Captain 2008 leans clearly harder on variance.
International Cricket Captain 2008
weather and pitch conditions randomized
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.
International Cricket Captain 2008
team selection and match strategy
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.