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.

Execution · Practiced Mastery
Precise shot aiming plus planning the run-out several balls ahead.

Execution · Practiced Mastery
Clean driving lines under pursuit pressure, with an economy that punishes crashing.
8 Ball Pool leans Execution (Practiced Mastery); Need for Speed: High Stakes leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
8 Ball Pool
A perfect aim-line cheat wins nearly every rack outright
Need for Speed: High Stakes
Cornering and racing lines at speed are the whole test
8 Ball Pool leans a little harder on reads, though the gap is small.
8 Ball Pool
Opponents alternate turns; little adaptive interaction to predict
Need for Speed: High Stakes
Police and rivals follow predictable AI routines
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
8 Ball Pool
Break spreads add some randomness to each rack
Need for Speed: High Stakes
Traffic placement adds mild run-to-run chaos
8 Ball Pool leans a little harder on optimization, though the gap is small.
8 Ball Pool
Position play and run-out planning separate good players
Need for Speed: High Stakes
Car choice, upgrades and career economy reward planning
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.