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
The fastest mainline Souls, distilling the formula into aggressive boss duels.

Execution · Practiced Mastery
Precise car control married to tuning and racing-line study.
Dark Souls III leans Execution (Practiced Mastery); Forza Motorsport 3 leans Execution (Practiced Mastery).
Dark Souls III leans a little harder on execution, though the gap is small.
Dark Souls III
fast roll timing against aggressive scripted bosses
Forza Motorsport 3
Braking points and throttle control define lap times
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dark Souls III
PvP invasions exist but are optional
Forza Motorsport 3
AI drivers follow predictable racing lines
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Dark Souls III
fixed encounters converge after first sight
Forza Motorsport 3
Clean circuit racing leaves little to chance
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dark Souls III
movesets and builds are fully mappable
Forza Motorsport 3
Tuning, upgrades and line study are half the lap time
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.