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
Licensed bike riding and building that asks little beyond basic handling.

Execution · Practiced Mastery
A cinematic open-world western leaning on shooting feel and atmosphere.
American Chopper leans Execution (Practiced Mastery); Red Dead Redemption 2 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.
American Chopper
Bike handling on missions is the only real demand
Red Dead Redemption 2
Gunplay and Dead Eye reward aim and timing.
Red Dead Redemption 2 leans a little harder on reads, though the gap is small.
American Chopper
AI riders follow fixed lines
Red Dead Redemption 2
Enemies use scripted AI patterns, not adaptation.
Red Dead Redemption 2 leans a little harder on variance, though the gap is small.
American Chopper
Courses and missions are scripted
Red Dead Redemption 2
Some hunting and weather randomness, lightly hidden.
Red Dead Redemption 2 leans a little harder on optimization, though the gap is small.
American Chopper
Chopper part choices matter, but shallowly
Red Dead Redemption 2
Loadouts and routes solvable but loose.
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.