head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Reads · Grand Arena
Cold-War base-builder where tight production queues and superweapon races define competitive play.

Execution · Grand Arena
Acclaimed basketball sim where playcalling and matchup reads decide online games.
Command & Conquer: Red Alert 2 leans Reads (Grand Arena); NBA 2K11 leans Execution (Grand Arena).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Command & Conquer: Red Alert 2
Superweapon timing and unit grouping require practiced multitasking
NBA 2K11
Shot-stick timing and dribble moves
Command & Conquer: Red Alert 2 leans a little harder on reads, though the gap is small.
Command & Conquer: Red Alert 2
Opponent faction and rush timing must be scouted and predicted
NBA 2K11
Human defenders bait and adapt possession to possession
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Command & Conquer: Red Alert 2
Map layout is fixed; very little hidden RNG in unit behavior
NBA 2K11
Shooting rolls add mild noise
Command & Conquer: Red Alert 2 leans a little harder on optimization, though the gap is small.
Command & Conquer: Red Alert 2
Build queues and power grid management are highly optimizable
NBA 2K11
Playbooks, matchup exploits, and roster knowledge
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.