head to head
Neither is simply harder - they are hard in different places. Panzer General demands more variance; Portal 2 demands more execution.

Optimization · Pure Optimization
Classic turn-based operational wargame about blitzing across WWII campaign maps with a carryover core army.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Panzer General leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Portal 2 leans clearly harder on execution.
Panzer General
Turn-based hex moves; no physical demands
Portal 2
Portal placement requires some precision but timing is lenient.
Panzer General leans a little harder on reads, though the gap is small.
Panzer General
Scripted AI opponent; no adaptive modeling
Portal 2
No opponent; puzzles are static.
Panzer General leans clearly harder on variance.
Panzer General
Combat dice rolls and hidden enemy deployments
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans a little harder on optimization, though the gap is small.
Panzer General
Prestige economy, unit upgrades, optimal advance routing dominate
Portal 2
Solving the puzzle's logic IS the entire game.
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.