head to head
Aion asks more than Red Dead Redemption 2, and the gap is reads.

Execution · Practiced Mastery
A PvP-centric MMO where aerial execution and reading opponents in Abyss battles define competitive performance.

Execution · Practiced Mastery
A cinematic open-world western leaning on shooting feel and atmosphere.
Aion leans Execution (Practiced Mastery); Red Dead Redemption 2 leans Execution (Practiced Mastery).
Aion leans a little harder on execution, though the gap is small.
Aion
Aerial combat and combo chaining require timing and positioning
Red Dead Redemption 2
Gunplay and Dead Eye reward aim and timing.
Aion leans clearly harder on reads.
Aion
Rifting and Abyss PvP feature real adaptive opponents
Red Dead Redemption 2
Enemies use scripted AI patterns, not adaptation.
Aion leans a little harder on variance, though the gap is small.
Aion
Enchantment stone RNG is a meaningful hidden-information layer
Red Dead Redemption 2
Some hunting and weather randomness, lightly hidden.
Aion leans clearly harder on optimization.
Aion
Manastones and gear sets have well-known optimal configurations
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.