head to head
Neither is simply harder - they are hard in different places. ESPN NFL 2K5 demands more variance; StarCraft demands more optimization.

Execution · Grand Arena
The beloved budget football sim whose play-calling chess still defines the genre's high point.

Optimization · Grand Arena
A real-time strategy classic where perfected build orders and mechanical speed decide most matches.
ESPN NFL 2K5 leans Execution (Grand Arena); StarCraft leans Optimization (Grand Arena).
StarCraft leans a little harder on execution, though the gap is small.
ESPN NFL 2K5
Stick skills on passes, jukes, and tackles
StarCraft
APM and micro control ceiling is huge
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
ESPN NFL 2K5
Play-calling is a guessing duel against humans
StarCraft
scouting and predicting human opponent builds
ESPN NFL 2K5 leans clearly harder on variance.
ESPN NFL 2K5
Fumbles, tipped balls, and unseen play calls
StarCraft
minimal hidden info beyond fog of war
StarCraft leans clearly harder on optimization.
ESPN NFL 2K5
Playbook mastery and franchise roster management
StarCraft
build orders and economy are near-solvable
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.