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

Execution · Practiced Mastery
Stick-controlled tennis testing swing timing and percentage shot selection.

Execution · Practiced Mastery
A modern-war reboot following Tier 1 operators in Afghanistan.
Grand Slam Tennis 2 leans Execution (Practiced Mastery); Medal of Honor (2010) leans Execution (Practiced Mastery).
Grand Slam Tennis 2 leans a little harder on execution, though the gap is small.
Grand Slam Tennis 2
Total Racket Control stick swings demand precise timing
Medal of Honor (2010)
Modern gunplay in campaign and multiplayer
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Slam Tennis 2
Versus humans, disguising shot placement is genuine prediction
Medal of Honor (2010)
Competitive MP adds human prediction
Medal of Honor (2010) leans a little harder on variance, though the gap is small.
Grand Slam Tennis 2
Ball physics are nearly deterministic
Medal of Honor (2010)
Scripted campaign, modest MP randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Slam Tennis 2
Shot selection and court positioning follow learnable percentages
Medal of Honor (2010)
Loadouts and map control are learnable
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.